The increasing number of competitors both in local and international market forces the organisations to develop various market strategies especially in creating and capturing customer’s loyalty. One of way is through improvement of supply chain. Consequently, to reduce cost and improve service levels, effective supply chain strategies must take into account the interactions at the various levels in the supply chain. ‘Make’ or ‘Buy’ decision can be seen in supplier selection process. In journal studies the effective strategy ‘Make’ or ‘Buy’ should be adapt to minimize the total costs of supply chain. ‘Make’ decision refers to the condition in that supply chain aims at integrating plant and supplier operations, controlling supplier quality, considering lead time, transportation, and warehousing costs. ‘Buy’ decision refers to condition in that lack of insourcing dexterity can be seen.
The author generated two different cases that follow different strategic decisions two-echelon supply chain design and supplier selection strategic and solved with few examples respectively. A special model is separately formulated for each case. The difference among the models is in their supply strategy of supply chain Computational experiments carried out show the efficiency of the proposed models for making decision about selecting the best strategy. In this paper, two different cases are defined and modelled by considering ‘Make’ or ‘Buy’ strategy, which deals with strategic decisions of making or buying. First case the outsourcing suppliers are chosen for providing all raw materials, Buy decision. Second case the insourcing suppliers are chosen for providing all raw materials, Make decision. A supply chain has a three manufacturing plants that produces a product, which is composed of three raw materials. These three raw materials are supplied by six potential suppliers of whom only two suppliers are chosen. The