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Channel coordination (or supply chain coordination) aims at improving supply chain performance by aligning the plans and the objectives of individual enterprises. It usually focuses on inventory management and ordering decisions in distributed inter-company settings. Channel coordination models may involve multi-echelon inventory theory, multiple decision makers, asymmetric information, as well as recent paradigms of manufacturing, such as mass customization, short product life-cycles, outsourcing and delayed differentiation. The theoretical foundations of the coordination are based chiefly on the contract theory. The problem of channel coordination was first modeled and analyzed by Anantasubramania Kumar in 1992.〔Kumar, A.: ''Supply Contracts and Manufacturing Decisions'', Graduate School of Industrial Administration, Carnegie Mellon University, Pittsburgh, PA, 15213, 1992.〕 == Overview == The decentralized decision making in supply chains leads to a dilemma situation which results in a suboptimal overall performance called double marginalization.〔Tirole, J.: ''The Theory of Industrial Organization''. MIT Press, 1988. (ISBN 0-262-20071-6)〕 Recently, partners in permanent supply chains tend to extend the coordination of their decisions in order to improve the performance for all of the participants. Some practical realizations of this approach are Collaborative Planning, Forecasting, and Replenishment (CPFR), Vendor Managed Inventory (VMI) and Quick Response (QR). The theory of channel coordination aims at supporting the performance optimization by developing arrangements for aligning the different objectives of the partners. These are called coordination mechanisms or schemes, which control the flows of information, materials (or service) and financial assets along the chains. In general, a contracting scheme should consist of the following components:〔Li, X., Wang, Q.: Coordination Mechanisms of Supply Chain Systems. Invited Review. ''European Journal of Operational Research'', 179(1), pp. 1-16, 2007.〕 * local planning methods which consider the constraints and objectives of the individual partners, * an infrastructure and protocol for information sharing, and * an incentive scheme for aligning the individual interests of the partners. The appropriate planning methods are necessary for optimizing the behavior of the production. The second component should support the information visibility and transparency both within and among the partners and facilitates the realization of real-time enterprises. Finally, the third component should guarantee that the partners act upon to the common goals of the supply chain. The general method for studying coordination consists of two steps. At first, one assumes a central decision maker with complete information who solves the problem. The result is a first-best solution which provides bound on the obtainable system-wide performance objective. In the second step one regards the decentralized problem and designs such a contract protocol that approaches or even achieves the performance of the first-best. A contract is said to coordinate the channel, if thereby the partners' optimal local decisions lead to optimal system-wide performance.〔Cachon, G.P.: (Supply Chain Coordination with Contracts ). In de Kok, A.G., Graves, S.C. (eds): ''Supply Chain Management: Design, Coordination and Cooperation. Handbooks in Operations Research and Management Science'', 11, Elsevier, pp. 229-339, 2003. (ISBN 0-444-51328-0)〕 Channel coordination is achievable in several simple models, but it is more difficult (or even impossible) in more realistic cases and in the practice. Therefore the aim is often only the achievement of mutual benefit compared to the uncoordinated situation. Another widely studied alternative direction for channel coordination is the application of some negotiation protocols.〔Stadtler, H.: A Framework for Collaborative Planning and State-of-the-Art. ''OR Spectrum'', 31, pp. 5-30, 2009.〕〔Albrecht, M.: ''Supply Chain Coordination Mechanisms'' Springer, 2010. (ISBN 978-3-642-02832-8).〕 Such approaches apply iterative solution methods, where the partners exchange proposals and counter-proposals until an agreement is reached. For this reason, this approach is commonly referred to as collaborative planning. The negotiation protocols can be characterized according to the following criteria: * The initial proposal is most frequently generated by the buyer company which is called upstream planning. By contrast, when the initiator is the supplier, it is referred to as downstream planning. In several cases there already exists an initial plan (e.g., using rolling schedules or frame plans). There are also some protocols where the initial plan is generated randomly. * In order to guarantee finite runtime, the maximal number of rounds should be determined. In addition, the protocol should also specify the number of plans offered in each round. When the number of rounds or plans is high, the practical application necessitates fast local planner systems in order to quickly evaluate the proposals and generate counter-proposals. * Generally, the negotiation protocols cannot provide optimality, and they require some special conditions to assure convergence. * The counter-proposals usually define side-payments (compensations) between the companies in order to inspire the partner deviating from its previously proposed plan. An also commonly used instrument for aligning plans of different decision makers is the application of some auction mechanisms. However, “auctions are most applicable in pure market interactions at the boundaries of a supply chain but not within a supply chain″,〔 therefore they are usually not considered as channel coordination approaches. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Channel coordination」の詳細全文を読む スポンサード リンク
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