The diploma thesis deals with selection and evaluation of phone accessories suppliers for ZONES s.r.o. company and evaluates their possible risks. In thesis is created decision model which is using fuzzy logic. The main part of the thesis consists of proposals for the evaluation of the company's suppliers. At the beginning of thesis are theoretical bases which will be used in the practical parts. Decision models are created in Microsoft Excel and MATLAB. The fuzzy model is based on requirements of the company. Another part of the thesis deals with analysis and comparison of results from both programs. The result of this thesis is the model which is easy to use and improves selection and evaluations of phone accessories for ZONES s.r.o. comp...