What is Fuzzy Decision Making

In today's globally competitive environment, firms give great attention for selecting right suppliers in the context of their supply chain management. Choosing right suppliers helps to reduce the purchasing costs and improve the quality of final products and services. Supplier selection problem is one of the multi-criteria decision-making problems which includes both qualitative and quantitative factors like unit cost, delivery on time, service quality, etc. Handling imprecise information is one of the most important problems for modeling supplier selection problem. In order to overcome this problem, many scientific researchers have been published during the years, and many mathematical theories have been used to handle uncertainties in supplier selection problem such as fuzzy set theory, stochastic theory, rough set theory, and some hybrid techniques, etc. This chapter aims to provide short review on SSP methods under uncertainty. The sources used for the study consist of scientific refereed journals and books and are selected with respect to their citation rate and the ability of presenting the contained technique well. Also, the publications in languages other than English and non-refereed professional ones are not included.