The Supply Chain Management Business Essay
The main objectives of this research are to structure a supply network through multiple tiers. It extends in identifying the importance of Supplier relations management. Today's market as we know is customer driven, with extensive subcontracting, Inventory and supply chain management can make or break a deal. Good supply network emphasizes on seamless integration between Original Equipment Manufacturer (OEM) and its suppliers. It encourages in merging its design of Product, process and services. Regard to today's world, Global Supply chain Management is changing virtually every day (group, June 2006 ) Large and Small companies are keen and very likely to trade internationally and also to take advantage of low cost country's for their sources. (group, June 2006 ). This study takes a more holistic approach in identifying issues and constraints of global supply chain management. A very rigorous approach for optimally coordinating information, material and financial flow between supplier tiers is another objective of this study. Study is supported by mapping different models and approaches in order to provide a harmonic coordination within a closed supply network. As mentioned earlier small and large companies are turning their interest towards low cost developing countries for sources, this research intends to study current trends and opportunities among these developing nations for sustainable supply network coordination.
Chapter 2 Literature Review
This paper revolves around various objectives as discussed earlier. The purpose of a literature review is to describe the work that has been reported on a topic. It illustrates an individual's ability to identify vital information and sketch existing knowledge. This literature review is carried out to review current market trends and also to have a thorough knowledge correlating our main objectives. Ideas and thoughts of different authors has been analysed to demonstrate a more eccentric review of the topic. Few case studies has also been analysed to understand practical difficulties and competitive advantage of a better supply network design. Table 1 illustrates various definitions proposed by authors.
2.2 Multi Tier Supply Chain
Overview and key elements
In general many Manufacturing Organizations are a network production and distribution sites. They transfer raw materials to finished products and supply it to end users (billington 1992). Strategic supply chains are those in which "members are strategically, operationally, and technologically integrated"(Hult 2004) and are assumed to be a long-term stable relationships with a potential to change in accordance with the variable demands and market conditions(Hult 2004).
Inventories play a very important role at both macroeconomic and microeconomic levels (Jaber 2009). According to (Jaber 2009), Current inventory costs accounts to half of total logistical expenses of a supply chain(Lancioni 2000). Improper Inventory management in a supply chain usually tends to increase conflicts between entities of the supply chain i.e., between retailer, buyer, manufacturer and suppliers, which may result to inefficiencies of the supply chain.(Jaber 2009).
In a ideal supply chain every firm is considered to be unified, thus in an ideally integrated supply chain, end users or ultimate customers are the pulling force of a value chain unlike classical way of Manufactures pushing the goods out(Tan 2001). Realistically achieving full integration of a value chain is difficult with its complexity, thus strategically important business organizations are emphasized (Tan 2001). Key elements and activities of supply chain are as shown below.
Key Elements Of supply chain
According to (Christopher 2005), One important aspect of effective SCM is to reduce or completely eliminate Inventory issues between different entities/Organisation in a supply chain. He suggests eliminating this issue by effective information sharing of all stock levels. This concept is called ‘Co- Managed Inventory' CMI.(Christopher 2005).(Tan 2001) Suggest that primary focus of a SCM is to achieve efficient end product distribution from manufacturer to customer by replacing inventories with information. Supply chain management's philosophy also suggests that its operations are not concerned only with logistics, but expands through all other operations of an organisation to achieve a greater customer satisfaction and value.(John T. Mentzer 2001).Other basic characteristics of a SCM, according to (John T. Mentzer 2001) are
Considering the whole supply chain as a single entity and by this virtue, total inventory flow is managed in a SCM.
Orienting Intrafirm and interfirm operations with a strategic approach and thus reinforcing its capabilities by co-operative measures.
Unique/Personalized approach should be carried out for every customer to stay competitive and to achieve better customer satisfaction.
For years Supply chain was considered as channels for distribution. The main intent of channel distribution was to make each organisation more productive and efficient. It emphasized on making each organisation more profitable without considering its other counter parts of the channel, i.e. like Tier1 suppliers, tier2, distributors or retailers (Lancioni 2000). Over the years with the advent of Supply chain management, focus drifted from intrafunctionaltowards a more interfunctional vision, by which co-ordination between these entities of SCM was emphasised. Interfunctional Channel distribution or termed as the modern day supply chain management considered the opportunity in supply network coordination: ". . . altering the levels of the various activities, often referred to as logistical in nature (such as transportation, inventories, facility location, and order processing) may adversely affect achieving the objectives of these other functional areas"(Lancioni 2000). Thus customer becomes the driving force of supply chain management.
Supply chain analysis (SCA) deals with vertical inter dependencies between the firms; it also requires a systematic approach towards resource allocation and information exchange at every stage of production (Simchi-Levi 2000).
Globalization represents cross-border flow of finished goods and increase in global competitors, identifying opportunities and competitive supply chain within its industrial sector(John T. Mentzer 2006). Realistically Supply-chain Managers identify difference between a domestic and a global supply chain even if the conditions are same. It is found that complexity's designing Global supply chain is exponentially high compared to a domestic supply chain, also its ability to stay competitive lies in understanding subtleties of GSCM that exists only during cross border trade offs(John T. Mentzer 2006).
Supply chain distinguishes itself from its constituent entities with its integration of operations (Mahapatra 2004). Supply chain management goes beyond co-ordination among firms; it recognises inter dependencies among them and also delivers effective relationship management.
Logistics is an integral part of effective supply chain.(Pierpaolo Pontrandolfo 2003) Suggest that Logistics operations within an organization can be related to
Forward flow of goods both WIP and Finished goods
Information flow feedback
Management and Control
Network Analysis (NA) is a technique which provides many tools to map relationship between internal organisations. NA also concerns with horizontal dependencies unlike SCA (Sergio G. Lazzarini 2001). As SCA and NA there are many other analyses methodology's suggests the importance of Interdependencies between organizations,
According to (John T. Mentzer 2001) , the following activities are necessary to implement a better SCM.
Sharing risks and rewards mutually
Mutual sharing Information
Goals and focus to serve customers
Installing Long-term relations with suppliers and customers"(Mentzer 2001).
The term supply chain management had an increased influence over the past decade. For instance, Annual Conference of the Council of Logistics Management 1995, 13.5% of the conference sessions posted titles concerning the words "supply chain." At the 1997 conference, just two years later, the number of sessions about the terminology drastically increased to 22.4% (John T. Mentzer 2001). This increase has been steady all these years. This increase widely illustrates the global importance and benefits of Supply chain management. There are different types of channel relations in a supply chain as illustrated in Fig4.
Supplier Organization/OEM Customer
Figure3a: Direct Supply Chain
Supplier's Supplier Organization Customer's
Figure 3b: Extended Supply Chain
Ultimate Supplier Organization Customer Ultimate
The figure1 identifies different degrees of supply chain complexity they are direct, extended and ultimate supply chain. A direct supply chain consists of a supplier and a customer involved in upstream and downstream flow of (Products, services, finance and information)(Figure: 4a.)(John T. Mentzer 2001) Similarly an extended supply chain includes suppliers, Immediate suppliers and customers and immediate customer, all involved in the upstream and/or downstream flows of products, finances, services and info(Figure: 4b). Thus an ultimate supply chain includes all the organizations involved in all the upstream and downstream flows of products/services/finances, and information from the ultimate supplier to the ultimate customer. (Figure: 4c) illustrates the complex functions of an ultimate supply chains. This may include 3rd Party Financial institutions; this involvement may be a cause to reduce overall risk involved. Similarly Even logistical operations are also supported by (3PL) In figure:4c , a market research firm is also seen as an entity of this complex chain. These may very well support the Manufacturer by providing vital market information about their end users.(John T. Mentzer 2001).
Process of Supply chain management
Many organisations believe that with process approach it is difficult to reduce/optimize their production flow in SCM (Cooper 2000).
Customer relationship management
Customer service management
Manufacturing flow management
Product development and commercialization
Multi Levels Explained
It is necessary to understand different network analysis, methodologies to understand and resolve issues in designing a better supply chain management.
Fig2 illustrates a basic model of a multi tier supply chain. Each level has its own importance and prominent influence over the chain thus making every level an integral part of the complex system.
Fig2 is a sceptic of four level supply chain with centralised decision process. The different levels are as described below(Goyal 2009)
First level-This Level of supply network contains multiple buyers/Distributor.
Second Level- This level encompasses of Vendors or Manufacturer ie., Original Equipment Manufacturer.
Third level- This level contains Tier-1 /Immediate Suppliers of the supply chain.
Fourth level- This level contains different tier 2 suppliers. These suppliers support tier1 suppliers or directly to the manufacturer by providing product, service or finance.(Goyal 2009).
Levels of issue
The major issues at different levels that have to be addressed in a multi dimensional Supply chain are(David Simchi-Levi 2003).
Strategic level: Strategic level of decisions are vital which provides and long and sustainable effect on an organization. Major decisions like factory location, storage, Plant capacity and logistic network fall under this level.
Tactical level: These decision that change steadily(eg: every quarter) depending on market position, like transportation, production capacity, inventory policy, customer review etc.,
Operational level: These decisions are mostly day to day like scheduling, lead time, quotes, routing etc.,(David Simchi-Levi 2003).
According to (David Simchi-Levi 2003), the above issues can be addresses with few strategies as follows
Distribution Network Configuration
Supply Chain Integration and Strategic partnering
Outsourcing and Procurement Strategies
Contrastingly other author(Simon Croom 2000) looks to analyse supply chain management as different levels as addressed below.
Ø Dyadic Level: This level considers just two party relations, like Supplier-Manufacturer or Supplier-Retailer
Ø Chain Level: This level composes of relations with different dyadic levels, relations with customer-manufacturer-supplier-distributor-retailer etc.,
Ø Network Level: This level is concerned with all network operations like upstream and downstream flow.(Simon Croom 2000).
Areas of concern for Supply chain Literature
Figure 6: Principle component bodies of supply chain literature Source: (Simon Croom 2000)
2.3 Global Supply Chain Management [GSCM]
In this decade of global exploitation for raw materials, cheap and skilled labour has impounded interest towards global supply chain. Fig6 illustrates a typical Global Supply chain network.
Interfunctional characteristic of a value chain has grown more complex and non feasible. Manufacturers usually set up factories in foreign to take advantages of low cost labour, trade concession, reduced logistic expense for foreign market, subsidies in capital investment it also makes manufactures more reliable to customers due to their close proximity(Gargeya 2005).Greater needs for GSCM is debated in this chapter below.
Authors debate of many learning methodologies to understand framework of Global Supply chain management (GSCM). According to (Pierpaolo Pontrandolfo 2003) GSCM issues can be understood by an Artificial intelligence approach called Reinforcement learning (RL). Currently there are many such frameworks, helping different Multi National Company's as a business model.
(Barry 2004), describes "An enterprise may have lowest over-all costs in a stable world environment, but may also have the highest level of risk - if any one of the multiple gating factors kink up an elongated global supply chain!" In a global supply chain, supply risk should be identified, asses its possible occurrence and provided with a monetary value for better understanding, Company's should easily modify towards alternate suppliers (Barry 2004).
2.3aCurrent State Issues
However experts believe that Global supply chain are more complex and difficult to maintain unlike domestic SC. Transportation cost tend to increase substantially due to foreign location, also complicates decision making because of increased lead time(Gargeya 2005). The other factors that don't encourage Global supply chain are listed below (Gargeya 2005)
Inventory Cost Trade offs
Supplier availability and Quality
Different Language, Culture, practices
Difficulties in Material planning and demand forecast
Infrastructural incapability and non sophisticated telecommunication
Inadequate skilled labour, Technology and Equipments
Uncertain exchange rates
Instable economics and politics
Inconsistency of financial performance of supply chain.
Efficient product and service distribution to upcoming markets can only be provided if an effective marketing infrastructure is developed.(Richey 2001). Globalization process should be viewed as a network embedded with contemporaneous options, constraints and events(Richey 2001). It intends to look into developing a strategic supply chain development and implementation.
One of the challenge in a Global supply chain is development of a decision making model which incorporates almost every concerns of entities running across the chain(Mahapatra 2004). It is one of the biggest concerns to produce effective decisions to reduce risk. Considerable efforts has now been expended in developing this model, many conventional methodologies are adopted like, Simulation, Mathematical program, statistics etc., (Mahapatra 2004).
2.3 b Emerging Issues
Numerous Global Supply chain models have been proposed consistently by researchers to tackle issues. Diffusion in multiple plant production systems, globalized market has escalated researcher's interest towards this field. Fig11 illustrates one of the models that help to design a supply network. This model proposed by authors "Carlos J. Vidal" and "Marc Goetschalckx" illustrates an overlook of a decision making model to tackle transfer pricing and transport cost allocation problems. It is seen from fig6 that the suppliers are broadly classified as internal and external suppliers. For External suppliers it is clear that there is no possible decision for transfer pricing because they directly sell to organizations at market prices. Unlike external suppliers an optimal transfer pricing is determined using the model for internal suppliers (Goetschalckx 2001). A detail literature review of transfer pricing issue and its effect on Global supply chain will be discussed later in this chapter.
Table 2: Major international issues considered in selected global supply chain models Source: (Goetschalckx 1997)
Market place around Global supply chain is changing continually reflecting to more emerging issues. These issues have to be resolved in a very short span to stay competitive and to make supply chain more financially effective(Gargeya 2005). First issue is dramatic increase of organizations, outsourcing its work to both domestic and international locations. Secondly many industries outsourced with a unidirectional and enterprise level motive, but now strive to coordinate its decision process across different levels of suppliers(Gargeya 2005). Third issue is recent development in the field of supply chain resulting in expanded definition of "supply chain performance, as mission, strategy and objectives can vary considerably based on value of the product offered to the customer"(Gargeya 2005).
Even with extreme significance and necessity for Global Supply chain management, the subject is complex and diffuse. Many technique and methods have emerged from different areas like operations, logistics, sociology, International relationship, marketing, management, economics et,. But still due to its significant growth and complexity it becomes hard to keep abreast with current development in the field of GSCM (John T. Mentzer 2006). Cementing is the fact that many of these methodologies has evolved with little interdependency, considering little attention in relating with existing models (John T. Mentzer 2006).
Outsourcing and Global Supply chain management focus to cost reduction, improved quality; thus increasing its overall competitiveness through structure and process that increase managerial commitment and competencies (Richey 2001). On other hand increased outsourcing of manufacturing to foreign locations in recent years has influenced mangers to design their supply chain considering not only in-house facilities but also to incorporate supplier capabilities and infrastructure. Broader criteria are taken into account while selecting the suppliers unlike fundamental ways. Suppliers are chosen based on customer's perception of suppliers to meet demand, with suitable attributes such as quality, quantity, delivery, service, price etc.,. In some case more broader criteria as defined by total ownership cost for carrying inventory, training and repair (Meixell 2005). Supplier selection escalates structure of design problems with limitations in number of vendors in a certain geography, minimum order quantity, geographic preference and supplier capacity (Gargeya 2005).
Supply network integration through a supply chain also influences Global supply chain design. Business process integration is one of the best options, coordinating decision across multiple tiers of suppliers/vendors. In reality organizations engage in coordination activities like "Vendor Managed Inventory (VMI), Collaborative Planning, Forecasting, and replenishment (CPFR)" (Gargeya 2005) by sharing sales promotion information. Advanced planning system (APS) integrate production decision making process, these systems are designed with precautions having Supplier capacity and Inventory in mind. These constraints influence Global Supply chain design in large scale (Gargeya 2005). As part of global supply chain design many factors like import duties has to be designed while framing since they contribute nearly 5-10 % of total cost (Pierpaolo Pontrandolfo 2003).Thriving through these issues, a well-coordinated and integrated design of Global Supply chain is hard to replicate thus making is very efficient and helps to achieve a competitive strategy in global scale (Gargeya 2005).
2.3cNeed of Global Supply chain Management: Market Drift
Global Supply chain models are complex and difficult to provide a solution compared to a domestic supply chain. In a global supply chain flow of cash and information is difficult to maintain unlike single country model. Inclusion of various taxes, Transfer pricing, duties, exchange rates, trade barriers are basic necessity to instil a real time supply system (Goetschalckx 1997).
Today's market has advanced with increased globalization of supply sources and demand, drastic improvement of information transparency, innovative business models and venture capital. With such high competitive nature, Simple pursue for higher market share is no longer effective in improving profitability. Focus has drifted towards redefining their competitive profit zone; Companies now tend towards co-relationship to capture life time customer rather than mass buyers through strategic development and Management partnership (John T. Mentzer 2006).
Global Market has immensely changed in these following factors
Increase value of end users over mass buyers
Importance of customization
Emerging global consumer segment
Time and quality related competition
Improvements in communication
Value for Information sharing
Changing government policies
Power shift to End users
In broad spectrum of supply chain power has shifted towards End users. Customer satisfaction becomes the ultimate goal. Interfirm relation and collaboration is critical to increase customer satisfaction.(John T. Mentzer 2006). Original equipment manufacturers and supporting suppliers should be quick to react to customer requirements or else have to face prospect of losing market share.
Mass customization results in increase in variety without compromising quality, price and efficiency i.e., customers expect better quality level and customization for low or competitive cost. This level of customization can only be achieved with full commitment of every entity of a supply chain like employees, distributors, suppliers etc,(John T. Mentzer 2006).
Global competitive market means unit of business analysis of an organization is whole world not just a country/region. Communication revolution has offended late design or delay in delivery. In this context, "Kotler Philip" said "As firms globalize, they realize that no matter how large they are, they lackthe total resources and requisites for success.Viewing the complete supply chain forproducing value, they recognize the necessity of partnering with other organizations(John T. Mentzer 2006) ".
Time and Quality importance
Time and Quality focused market competition can be achieved by basic Lean methodologies, reducing waste in the form of time, defects etc,. Improved quality not just means finished goods but also every area of a company.(John T. Mentzer 2006)
Information Technology Influenced
Most Powerful and conceptual influence is through immense improvement in the field of Information technology. Invention of modern computers superseded monolithic companies. Fast communication increased link between every member also eliminating multiple layers of people serving as information channel and control group, reducing cost and improved linkage eliminating time delays(John T. Mentzer 2006).
2.3d Benefits of Global Supply chain
In this competitive world, market research is a fundamental aspect of any organization's design process. Anticipated results are an aspect of a design process, so it is necessary to understand possible benefits of Global Supply chain.
Few benefits described by (Mechanic 2010), are
Highest standard of quality.
Increased standard expectancy from developing nations.
Reduced Inventory and Transportation.
Make or buy decisions simplified.
Wider marker scale to target (New Market opportunity).
Opportunity to learn and adapt business models around the globe.
Increase in Supply chain flexibility.
Surviving Economic recessions with auxiliary markets.
2.4 Supply Network design and collaboration
2.4 a General literature
According to (Sheng Su 2008)"A supply chain is an integrated network of suppliers, transformation plants and distribution channels which are organized to acquire raw materials, transform the materials into final products, and deliver those products to customers(Sheng Su 2008)".
Recent developments in technology have forced typical sequential manufacturing industry into designing current ideas for business-business relationship with companies in supply networks (james B. Rice Jr 2002).
(james B. Rice Jr 2002) Suggest that, Organizations which are looking for coordination across a strategic supply chain can be achieved by three independent segment coordination such as
Financial trade off's
Author (Christine Harland 2003) describes the increasing complexity in supply networks. In growing market, issues can arise due to various reasons. Following table illustrates few origins of issue
Product /Service complexity
Increasing demand and expectancy of more complex and customized products has led to many complexity in SCM like delivery system, quantity of alternative design, employee skill-set, level of supplier commitment etc.,
Changes business structure and creating imbalance within the network, Lead to International outsourcing in order to stay competitive
It results in more complex SC network involving transnational flow of man power, money and products
This platform of doing business through internet helps organization to respond quickly to customer demands but eventually increase complexity of SCM.
Table 3: Increasing Complexity in Supply network Source (Christine Harland 2003)
Design of supply network can be approached as stages, Production, Procurement and distribution. Each stage can be scattered across supply network positioned anywhere in the globe as illustrated in fig11 (D.J. Thomas 1996).
Designing and coordinating supply chain for a specific product usually tends to break functional and boundary barriers, resulting as a major issue. Functional boundaries can be deceiving in delivering knowledge thus a clear understanding is hard even for top management (D.J. Thomas 1996).
Supply chain management is a new concept but coordinated planning has a profound history since early 1960 (D.J. Thomas 1996). Since then researchers had focused to integrate planning, scheduling and distribution (D.J. Thomas 1996), some of the early models and their functionality are review later in this chapter as illustrated in tables 7-13.
Inventory Management barrier
Managing Inventory is a vital and significantly increases customer satisfaction and also improves profit. According to (Billington 1992), there are 13 pitfalls in Inventory management.
No Supply Chain metrics: Generally it is found that there is no strict performance metrics used to evaluate each entity of the supply chain. Usually individual organizations inside a supply network may have conflicting objectives which tends to reduce overall efficiency. This issue has to be addressed by assessing and orienting supply chain metrics which is governed by customer satisfaction criterion (Billington 1992).
Inadequate definition of customer service: Usually customer service does not mean just better delivery time or quality. Many critical details like order cycle time and back order time et., these issues can be omitted by proper understand of customer and standards of expectancy (Billington 1992).
Inaccurate Delivery status date: This clerical issue can result in massive impact on total efficiency of the supply chain. It can be resolved by centralized data storage under regular monitor (Billington 1992).
Inefficient information systems: These issues mostly resolved with recent developments in Information Technology. Software's like Enterprise resource planning can help to resolve this issue.
Ignoring the impact of uncertainties: In a supply chain there can be different sources for uncertainties as, supplier lead time, raw material quality, process lead time, Transportation and fluctuating market etc., Implementation of Just-In-Time (PULL System) can help to resolve these issues as this system monitors uncertainties closely and react immediately (Billington 1992).
Simplistic inventory stocking policies: This issue can be resolved with efficient safety stock policies (Billington 1992).
Discrimination against internal customers: This is caused when Work in Progress goods are delivered and handled with your supplier unlike finished products to ultimate customer (Billington 1992).
Poor coordination: as mentioned earlier in this research, harmonic network coordination is a fundamental entity of supply chain. Better coordination can be achieved by effective Supplier relationship management
Incorrect assessment of Inventory costs: Occurrence of this issue is generally by omitting few inventory maintenance cost while formulating supply chain, usually
An effective supply chain design helps in identifying best, Location and distribution centres, Plant Capacity, Market access and planning. It also simplifies both operational and tactical decision making (GZARA 2008).
Alongside with company's internal issue, information and standards of data makes it complex in formulating a global supply chain (D.J. Thomas 1996)
In a Supply chain, to achieve an effective integration of Production-distribution planning, higher quantity of manufacturing should be scattered among various production plants. Similarly WIP goods and finished goods Inventory should be kept at minimum level (Sheng Su 2008). Transport cost should also be incurred into network design as logistics influence operational cost in a great extent. Structure of a product is an important factor affecting its production planning for e.g., Simple assembly structure of a product is easy, it can be achieved by simply adding all demands of subassemblies. While planning a divergent structure, Planning Input amount directly depends on demand of all output process. Input process amount should be equal or Higher compared to Output demand (Sheng Su 2008).
Transportation pattern is a key factor for integrating logistical operations across a supply network. Single or multiple material travel plans are ideal patterns (Xu 2008).
Single Material Transportation - This pattern is used while transporting single material inevitably like in Chemical industry. Where multiple products cannot be transported at same time.
Multiple Material Transportation - It is most common and widely used e.g., solid material transport.
In centralized supply chain, operating under different levels of hierarchy it is complex to introduce decision process based on its hierarchy levels. This can be solved be introducing multiple echelons in a supply network which has own decision making capability (Chan 2004). Author also suggests that control and governance over a supply network is no longer centralized and information sharing is partial (Chan 2004).
To design a supply network for a new product a three phase methodology can be useful; they are i) Data Collection ii) modelling iii) Solution (Renee J. Butler 2006).
This Phase involves in identifying auxiliary production and distribution plants meeting all criteria; technology, Cost and Capacity. Vital uncertainty parameters should be identified and incorporated as design parameters. Combination of uncertainty's can be derived into scenarios and important scenarios should be considered during this phase (Renee J. Butler 2006).
Modelling phase here input data is converted into "Mixed integer programming model". Profit ratio and expectancy is also estimated to incur robustness criterion. Risk assessment and relative expectancy is considered as basic probability problem and concurrent standard deviation is calculated for modelling (Renee J. Butler 2006).
In this phase final adjustments and probable parameters are used to come up with a solution. Results help manufactures to determine a supply network outline and its considerable investment Evaluation (Renee J. Butler 2006). Fig10 illustrates the design process and its parameters.
2.4 b Co-ordination Incorporated in Supply chain
Supply Network Co-ordination is nothing but interdependencies within a supply chain. In a supply network, mutually beneficial organizations work together mainly towards better customer satisfaction.
This research attempts to analyse different supply network models and represent design process of some key models. Mathematical simulation of these models is not represented.
Coordination in a supply chain management can be categorised into three major areas of interest as, Operational, Strategic and Environmental concerned Coordination (Griffin 1996).
Operational Coordination:To achieve operational coordination, Supply chain management models focus on issues like batch size, lead time, mode of transportation etc., Specific targeted operational models are as shown below.
In a Manufacturing industry nearly 50 % of total cost is spent in buying raw materials and subassemblies (Griffin 1996). Many models have focused on generating a model to find out optimal order quantity. But (Griffin 1996) suggest that reduction in cost can be achieved by two ways. I) For same order quantity cost reduction can be possible by enhancing material handling technology like Electronic data interchange (EDI) (Griffin 1996). II) Both buyer and vendor can jointly evaluate a mutually beneficial optimal order quantity (Griffin 1996). Table4 illustrates some models which focus on Buyer-Vendor Coordination.
Various models focus on production planning and distribution planning individually. But still there are few models which can help to tackle both the issues simultaneously. Transport routing and machine scheduling fall under this category (Griffin 1996). Table 5 illustrates some proposed models.
These models focus on reducing inventory levels and waste in distribution (Griffin 1996). Few models proposed are illustrated table 6
Buyer Vendor Coordination models
K*=Factor by which optimal cost should be increased
S2,S1 = Ordering Cost of buyer
Single product and Single buyer scenario
Q*= Optimal Join prod order quantity
D=buyers annual demand
P=Producers annual production rate
r= Unit Carrying charge and Cv, Cq are Unit prod and purchase cost
Lot Size model for Single buyer, single vendor
D=buyers annual demand
P=Producers annual production rate
r= Unit Carrying charge and Cv, Cq are Unit prod and purchase cost
Lee and Rosenblatt(1986)
K=Optimal order quantity increase factor
Optimal order quantity of vendor= k*K
Extended model of Monahan (1984).
Anupindi and Akella(1993)
Kohli and Park (1994)
Lau and Lau (1994)
Table 4: Buyer vendor Coordination Models Source: (Griffin 1996)
Dynamic Programming algorithm to reduce prod cost and batch size optimally
Ishii, Takahashi and Muramatsu (1988)
Determines base stock levels and lead time to reduce Excess stock
Haq Vrat and Kanda (1991)
Developing Mixed Integer programming model to minimize batch size of production and distribution
Pyke and Cohen (1993, 1994)
Multiple product model focussing on finished goods replenishment order size
Single product system to maximize production and transportation quantities thus improving profit margin
Chandra and Fisher (1994)
Multi-customer and Multi-product model to reduce production and distribution cost
Table 5: Production-Distribution models Source: (Griffin 1996).
Clark and Scarf (1960)
A recursive decomposition approach to formulate two echelon inventory system
Muckstadt and Thomas (1980)
Determine performance of multi echelon system in a low demand system
Erkip, Hausman and Nahmis (1990)
Determine order policies to achieve optimal safety stock
Svorons and Zipkin (1991)
To formulate overall cost reduction model to identify base stock levels
Rogers and Tsubakitani (1991)
Determine optimal inventory levels for single component used in multiple products
Ernst and Pyke (1993)
Used in two echelon system to determine optimum truck capacity based on demand and lead time
Muckstadt and Roundy (1993)
Implementing Power-of two's policies to optimize multi echelon network
Van Eijs (1994)
It's approach is to reduce transportation cost for a buyer using (R,S) periodic review system
Table 6: Inventory-Distribution Coordination Source: (Griffin 1996)
Strategic Planning Co-ordination
Strategic Coordination in a supply chain is a factor that influences strategic decision making, these are Plant location, Technology, infrastructure development or to evaluate changes of a product life cycle (Griffin 1996). Models used for strategic models fall under the following categories (Griffin 1996).
Mixed Integer Programming Model
Most of Strategic coordinated models are based on mixed integer programming as it is a very old approach. These models effectively formulate supply constraints to solve production mix issues (Griffin 1996). Table7 illustrates few authors who proposed mixed Integer Programming models based on their category of study.
Strategic Planning model
These models are proposed by authors, who have approached strategic coordination with using mixed integer programming as,
Cohen and lee (1988, 1989)
Burns, Hall , Blumenfeld and Daganzo(1985)
Wikner, Towill and Naim (1991)
Lee and Billington (1993)
Kleutghen and McGee (1985)
Bitran and Sarkar (1994)
Geoffrion and graves (1974)
Kleutghen and McGee (1985)
Lee and Billington (1992)
Burns, Hall , Blumenfeld and Daganzo(1985)
Novack, Rinehart and Fawcett (1993)
Brown, Graves and Honczarenko (1987)
Van Roy (1989)
Gelders, Mannaerts and Maes (1994)
Cohen and lee (1988, 1989)
Martin, Dent and Eckhart (1993)
Wikner, Towill and Naim (1991)
Benjamin and Wingand (1995)
Lee and Billington (1993)
Geoffrion and powers (1995)
Bitran and Sarkar (1994)
Ashayeri, Westerhof, and Van Alst (1994)
'Sullivan and Geringer (1993)
Arntzen, Brown, Harrison and Trafton (1995)
Cohen and Lee (1989)
Berry, Naim and Towill (1995)
Table 7: Strategic Coordination Models Source: (Griffin 1996)
2.4c Supply chain design models: Related work
There are no one process or references for designing a supply chain but still Supply Chain-Operations reference model can be analysed to understand the outline of design process. Fig11 illustrates the steps involved and its respective advantages
Figure 11: SCOR reference model Source: Supply chain Council (SCC)
SCOR process and Benefits
According to (Beamon 1998), Decision variables in a supply chain model that influence performance measure are
Number of stages(echelons)
Tables 8-11, Reviews various issues of designing a supply chain models and availability of information technology to solve these issues by (Gargeya 2005).
Tables 12, 13 reviews various decision variables and performance measures influence over different supply network models by (Beamon 1998)
Tables 14-16, illustrate Benefits, Barriers and Bridges of different models of strategic supply chain, according to (Stanley E. Fawcett 2008).
Table 17, illustrates different characteristics of various Mixed Integer Programming Models of a Strategic supply chain. Source: (Goetschalckx 1997).
Table 18, is an overview of contributions to supply network. Source: (Pedersen 2010).
Table 16: Bridges to Strategic supply chai Source: (Stanley E. Fawcett 2008).
Main Characteristic of selected Mixed Integer Programming Model
Table 17: MIP model characteristics Source: (Goetschalckx 1997).
Table 17 Continued Sources: (Goetschalckx 1997).
Overview of contributions related to supply network
Table 18: Overview of contributions related to supply network Source: (Pedersen 2010)
Primary aspects of supply network structure
(Cooper 2000), Suggest three main aspects to understand SC network
Identifying Members of supply chain
During a supply network design, Identifying members or organizations to be considered for supply network is vital. Including every member makes it very complex to integrate and govern all process links. Key is to sort members which are critical to success of organization. Carrying out a market research based on production, information, finance and marketing can help to identify critical entities and their effect on ultimate performance and customer satisfaction (Cooper 2000).
Structural dimensions of network
It is a very important aspect of a supply network which helps in managing supply chain. These structural dimensions has to analysed under three categories Horizontal structureis outer circle of a supply network it includes number of tiers necessary for effective functioning. It is mainly concerned with, nature of your product. Vertical structureincludes number of suppliers or customers needed at each tier of supply network. Horizontal positionis the third aspect, It represent; purely location of the organization depending on certain criterion. For e.g. installing a production plant nearer to primary source of supply or a distribution centre close to targeted customer region etc (Cooper 2000).
Types of process links in supply chain
In a supply network there are numerous process links that exist across supply chain. Including all at same governance policy becomes complex and non productive. By critically evaluating these process links can be categorised as, (Cooper 2000)
Ø Managed Process Links
Ø Monitored Process Links
Ø Not Managed Process Link
Ø Non Member Process Links
2.5 Supply chain-Information integration
Successful Supply chain network should integrate and coordinate material flow, information flow and financial flow. It is found that information integration is a key mechanism to coordinate process and activities within a supply network (RAMAYAH 2010). Supply chain Integration focus on improving the quality of information shared within a supply network (Tim McLaren 2002). Information and material flow integration are one of the elements to qualitative performance measure of supply network (Beamon 1998).
Information should be fully accessible to every organisation in a supply chain and business structure should be modelled to take complete advantage of this information's (Groznik 2006). By sharing information in a supply network inventory cost can be greatly reduced (S. VISWANATHAN 2007). Advancements in information technology has ploughed way to advanced web based information sharing software's like Enterprise resource planning and Collaborative planning (S. VISWANATHAN 2007). Information sharing enables to identify global inventory levels unlike local inventory thus yielding a better inventory replenishment planning process (S. VISWANATHAN 2007).
Although information sharing is vital, many organizations still don't maintain transparency, this is due to lack of trust, policy or as a security measure (RAMAYAH 2010). This issue can bring up an adverse effect on both operational and strategic performance of supply chain. Information exchange coordinates activities among organization will influence decision making process to achieve common goals.
Elements across a supply chain require information to be shared at different levels. For e.g. in a supply network elements at upstream of a supply network needs to rely on information sent by downstream bodies to initiate or control their process/activities (RAMAYAH 2010) quality of information sent produce a positive influence for better performance. Quality of information has few characteristics like reliability, timeliness, adequate, completeness etc, (RAMAYAH 2010).
Supplier's having individual decision making can use information shared in their supply chain in order to optimize their performance level and also reduce cost (S. VISWANATHAN 2007).
Supply chain collaboration concepts like Vendor Managed Inventory (VMI) and Collaborative planning Forecasting and Replenishment (CPFR) focus mainly on information integration (S. VISWANATHAN 2007).
Quality and quantity of shared information is an important factor, moreover a few queries has to be answered regarding information sharing, they are
"Whom to share"
"How to share"
"When to share"
OEM's should send valuable and complete information to their suppliers which clearly focus on certain objectives like customer satisfaction etc (RAMAYAH 2010).
Impact of Information systems in SCM
Design and Implementation of Information technology in the field of SCM has not been appreciated as required. Particularly in the field of E-commerce and B2B business models (Ngai 2004).
In recent years new developments has arrived in the field of information systems, which supports effective supply chain management. Internet communications has eased complexity of supply chain with its quick and adequate information sharing. Internet and Electronic Data Interchange (EDI) plays a key role in virtual supply chains (Ngai 2004).
E business or Virtual enterprise are fairly new developments in IT, they help in better collaboration between suppliers and manufactures and provide solutions for production planning and scheduling issues (Sarv Devaraj 2007). Speedy and real time information sharing facilitates better decision making, resulting in a better performance of supply chain. Joint Development of demand forecast for entire supply chain is possible with E-business model. E-biz model can direct influence supply chain performance by production planning and scheduling or it still can influence indirectly by information consolidation and integration (Sarv Devaraj 2007). With all these benefits companies still hesitate to invest in redesigning to an IT supply chain. Analysing the reason behind, found debates relating to IT supply chain's demerits like,
Ø No integration between Information technology and business model
Ø Scarcity of applications of Virtual enterprise.
Influence of Information Technology on Supply chain can be classified based on its effects and contribution (Ngai 2004).
Strategic Planning for IT in Supply chain management
Inclusion Strategic planning is vital, as it contributes for a long term in a supply chain system (Ngai 2004).
Virtual enterprise and SCM
Virtual enterprise is a concept of subcontracting and vendor management, which helps the organization to respond to market fluctuation quickly. Virtual enterprise is linked with linear operational concept of SCM (Ngai 2004).
E-commerce and SCM
Emerging market is more direct, customers buying products online (B2C). (B2B) E-commerce has enormous influence over supply chain performance (Ngai 2004).
Infrastructure for IT in SCM
Infrastructure for IT is simply the hardware and software necessary for operations (Ngai 2004).
Knowledge and IT management in SCM
It requires a systematic process, in order to improve skill-set of employers and to be more innovative. Knowledge Management is very important to stay integrated with business objectives (Ngai 2004).
Implementation of IT in SCM
Implementation of IT in the Field of SCM should be approached as a project, which requires a joint effort by entire work force and Top Management dedication. Technological and Financial investment is also necessary (Ngai 2004).
Information System benefits for SCM (Sarv Devaraj 2007) :
Ø Quicker Information sharing
Ø Improved Customer relationship with easy access to information
Ø More Flexible to market trends
Ø Facilitate collaborative planning
Ø Increased Supply chain efficiency with help of real time information sharing
Ø Productivity improvement
Ø More affordable channel of communication.
2.6 Supply Network Collaboration
Collaboration in supply chain is a broad context; its contribution is far beyond just information sharing and integration (Tim McLaren 2002). It helps mutually beneficial organizations in a supply chain to deal with joint decision, product design and demand forecasting (Tim McLaren 2002). Information exchange is the fundamental of collaboration (Barratt 2004).
However, Network Collaboration has been ambiguous due to its lack of proper definition, ironically as (MATTHIAS HOLWEG 2005) says "For some, supply chain collaboration means simply holding consignment stock; for others it is a complete philosophy on how to control the stock replenishment and production rates across multiple tiers of their respective supply chain system (MATTHIAS HOLWEG 2005) ".
Strategic SCM demands collaboration irrespective of business model, size or mission (Horvath 2001). Motive of collaboration in a supply chain is, that outcome collaborative activity either being loss or gain is eventually shared by everyone across value chain (Hernández et al. 2008). Its functionality is to facilitate coordination among SC members based on decision models and activities (Hernández et al. 2008).
Collaborative SCM is beyond operational-level information sharing, it enables to eliminate waste, improve customer satisfaction and be more responsive to market demands (Tim McLaren 2002). Infrastructure requirement for a Collaborative SCM is proportional to its role and depth of participants (Horvath 2001).
In a Collaborative SCM degree of integration achieved influences better information and process sharing, fig13 illustrates different entity's of SCM and their relative integration, tighter integration mean, more closely aligned business models and trading methodology's (Tim McLaren 2002).
Inter-Organizational system for SCM Collaboration
Infrastructural measures for Collaborative SCM
(Horvath 2001) Suggest the following measures should be taken care for a successful Collaborative infrastructure
Open, low cost connectivity
Collaboration systems should be accessible to even small player in SC without huge investment; they should granted access into collaborative systems of various other organisations in the SC. Brower based collaborative will help small players to access through internet and can also utilize application hosted by other firms at nominal fee to avoid heavy investment on their own (Horvath 2001).
Very large, flexible, multimedia data storage capabilities
In collaborative activity; large files like engineering drawings, media files, program code, and documents will be accessed by various organizations. To increase speed and performance a common data base can be provided, it also helps to integrate every data along supply chain (Horvath 2001).
Systems and channel integration
SC entities should be able to access information regardless of their mode of communication, like website, intranet, web market, call centres, physical store etc. This influence, completeness of shared information (Horvath 2001).
Higher-level self service capabilities
Collaborative supply chain should offer new level of capabilities; these levels should not be of highly sensitive areas like price negotiation, dispute resolution etc. Introduced capability should be widespread and adapted and should require minimum training for adaptation (Horvath 2001).
Intelligence gathering and analysis
Flow if information through collaborative system should be of high standards and thus influencing its participant to acquire higher level self service capabilities. Information thus analyse should help firms to improve internal operations and subsequently improve supply chain performance level (Horvath 2001). Collaborative system should not pre determine goals rather help organization for continuous improvement.
Supply chain collaboration exchanges
Current state of e-business is confined to buying and selling but with improved collaboration systems; immense coordination can be achieved in D&D, manufacturing process, distribution, logistics and various other business entity (Horvath 2001).
Functionality's of collaboration as mentioned earlier can have positive effect over supply chain, but a clear understand is possible if we understand the need for collaboration. Both internal and external issues in a supply chain management have provided scope for network collaboration, these issues are,
Collaboration: Areas of concern
Improving internal supply chain activities and performance level has been a striving issue with many organisations (Barratt 2004). Scope or needs for collaboration in a supply chain are,
Ø Internal functions like purchasing, manufacturing are usually isolated from forecasting or planning. It may cause inventory level pile up and increase cost (Barratt 2004). Collaborating supply and demand functions be effective
Ø Emphasize on external activities like forecasting and ignoring internal activities (Barratt 2004).
Ø Organizations promote new product into market without anticipating demand. Many fail to fulfil demands due to sudden uplift in the market (Barratt 2004).
Ø Functional barriers and poor communication inside organization
Ø Poor understanding of internal process
Ø Internal responsibility assignment in departments where you have no control
Ø Imbalanced performance level across a supply chain may produce conflicting disturbance
Ø Dumping too much information without priorities can be deceiving and its most likely to be ignored due to magnitude of information
Ø Not seriously weighed organization reports.
Scope of Collaboration
3. Supply chain realization
Supply chain management is very fast growing field, urge of outsourcing, changing competitive market, Globalization, Introduction of JIT and many more factors has influenced organizations to look into integrated supply chain as a solution. It acts as a bridge between suppliers and customers maintaining a balance equation between customer demand and supplier capability.
Industries realized supply chain as an opportunity based on different criteria. Some important capabilities found through literature review are,
Improved Customer Satisfaction
Shortened product Life cycle
Improved Flexibility and quick response
Optimized Inventory management
Cost reduction and increased profit
Customer/demand driven business model
Real time information sharing
In recent years with improved supply chain coordination and collaboration has lead to more complex and efficient supply networks. Also with dramatic improvement in information technology have enabled organization to have full utilization of supply characteristics, IT has enabled even small scale industry sectors to take advantage in the field of Supply chain due its cost effectiveness.
New industries utilizing supply chain should carefully consider their business model and design its supply network accordingly with a vision of long term relationship. These organizations should take advantage of various existing supply network design models (Discussed in chapter 2.4c) and analyse with company's policy to come up with an efficient supply chain.
4. Supply chain coordination
Coordination is to maintain interdependencies within a supply chain, Different models and categories of coordination are explained in chapter 2.4b. fig 16 illustrates the steps to achieve network coordination.
It is seen from the above graph that the scope of coordination increases with increase in complexity, risks and benefits. This is a key factor while designing a supply chain for e.g. emerging industries should not look into full coordination of their activities as its complex, may result in complete breakdown of system. Interpreting from fig 16, a step by step approach is necessary in optimizing their activities.
Initial step for organizations looking into a coordinative supply chain should include the functions within their organization. These functions include, internal business department like marketing and production should work together towards mutually agreed plan.
Step 1: Supply chain/Information Integration
Information sharing is a key factor for measuring performance level of supply chain. Today's market is competitive and requires quick response to changing customer demands and with introduction to "Just in time "technique, real time information sharing has become a necessity. Emerging new management techniques like ‘Lean Management' and ‘agile management' and dramatic reduction in communication costs have influenced greatly towards supply chain integration (Hussain A.H Awad 2010).
Many industries focused on integrating information as an isolated process disjointed from value chain, but eventually they couldn't stay competitive in trend driven environment. It is necessary to include information sharing into supply chain attributes. (Barratt 2004), believes that many industries do not focus enough on internal infor