【正文】 and Level 4 represents the number of vendors. 4. Solution Methodology In this work, the multi criteria decisionmaking tools such as AHP and GRA are adopted to solve the vendor selection problem after selecting attributes and subattributes. In the first part, the AHP approach is used, since it can bine both qualitative and quantitative criteria making it an appropriate approach for solving the current problem. GRA approach is used in the second part because the calculations involved are faster and simpler than in AHP. The overview of AHP and GRA approaches are discussed below. . Overview of AHP The AHP12 is a decision making approach designed to aid in the solution of plex multiple criteria problems in a number of application domains. This method has been found to be an effective and practical approach that can consider plex and unstructured decisions. The AHP is proposed in this research in order to handle both tangible and intangible factors and subfactors affecting vendor selection decisions. The selection of the methodology is based on the characteristics of the problem and the consideration of the advantages and drawbacks of other methodologies. The decisionmaker judges the importance of each criterion in pairwise parisons. The oute of AHP is a prioritized ranking or weighting of each decision alternative. The research in this paper has focused on formulating an AHP and GRAbased integrated approach to select a best vendor for the rubber manufacturing plant. Basically, there are three steps for considering decision problems by AHP: constructing hierarchies。 Analytical Hierarchy Process (AHP). 1. Introduction At present, industries tend to focus only on their core business and resort more and more to outsourcing several of their production functions than in the recent past. In turn, this practice has created larger and more plex supply chains. The successful management of these chains is one of the cornerstones for panies to stay petitive. Basically industrial anizations have been divided in operative functions such as marketing, planning, production, purchasing, finance, etc. Supply chain is a strategy that integrates these functions creating a general plan for the anization, which satisfies the service policy, maintaining the lowest possible cost level due to the incredible petition environment that they are exposed to. A supply chain is a work of departments, which is involved in the manufacturing of a product from the procurement of raw materials to the distribution of the final products to the customer. Purchasing mands a significant position in most anizations since purchased parts, ponents, and supplies typically represent 40–60% of the sales of its end products. This means that relatively small cost reductions gained in the acquisition of materials can have a greater impact on profits than equal improvements in other costsales areas of the anization. The objective of vendor selection is to identify vendors with the highest potential for meeting customers? needs consistently and at an acceptable cost. Selection is a broad parison of vendors using a mon set of criteria and measures. However, the level of detail used for examining potential vendors may vary depending on customers needs. The overall goal of selection is to identify high potential vendors. To select likely vendors, the customer judges each vendor?s ability to meet consistently and costeffectively its needs using selection criteria and right measures. Criteria and measures are developed to be applicable to all the vendors b