Abstract In the current literature, supplier selection is an important Multi Attribute Group Decision Making (MAGDM) problem which heavily contributes to the overall supply chain performance. Several solutions for the above problem are proposed. In this paper, TOPSIS and Borda’s function approach, which is one of these methods, is discussed. So that, in the present model, irst TOPSIS is used to ind the individual preference ordering. Then, Borda’s function is used to ind the collective preference orderings. Finally, a simple example is provided in order to demonstrate its applicability and effectiveness of the proposed method. Keywords: MAGDM, Topsis, Borda’s Function, Supplier Selection Problem A Multiple Attribute Group Decision-making Model for Selecting the Best Supplier Mohammad Azadfallah* * Researcher, Business Studies and Development Ofice, Saipa yadak (Saipa after sales services), Islamic Republic of Iran. Email: m.azadfallah@yahoo.com Introducion Multi Attribute Decision Making (MADM) is an important component of modern decision science. The theory and methods of MADM have been extensively applied to the ields of engineering project, economy, management and military affairs, such as investment decision making, venture capital project evaluation, facility location, bidding, maintenance services, military system eficiency evaluation, development ranking of industrial sectors, comprehensive evaluation of economic performance, etc. Essentially, MADM is to select the most desirable alternative(s) from a given inite set of alternatives according to a collection of attributes by using a proper means. It mainly consists of two stages: 1. collect decision information. The decision information generally includes the attribute weights and the attribute values, especially, how to determine the attribute weights is an important research topic in MADM. 2. Aggregate the decision information through some proper approaches (Xu, 2015). The increasing complexity of the socio-economic environment makes it less and less possible for a single expert or decision maker to consider all relevant aspects of a problem. Therefore, complex decision problems usually have to be conducted by integrating a group of expert’s knowledge and experiences. Generally, the practice of Multiple Attribute Group Decision Making (MAGDM) is to invite internal experts, external experts, or their combination of related ields to evaluate each attribute of every alternative individually. In the MAGDM, the experts usually have diverging opinions, because they often come from different specialty ields and each expert has his/ her unique characteristics with regard to knowledge, skills, experience and personality. Thus, how to obtain the maximum degree of consensus or agreement from these experts for the given alternatives is an interesting and important research topic (Li & Sun, 2012). On the other side of this coin, supplier selection is a fundamental issue of supply chain area that heavily contributes to the overall supply chain performance, and also, it is a hard problem since supplier selection is typically a Multi Criteria Group Decision problem (Izadikhah, 2012). In this paper to solve this problem, TOPSIS and Borda’s function approach is proposed. TOPSIS (Technique for Order Preference by Similarity to an Ideal Solution) proposed by Yoon and Hwang is one Article can be accessed online at http://www.publishingindia.com