Supplier Selection and Supplier Risk Assessment with Using Grey-Based TOPSIS Method (Gri ilişkisel temelli TOPSIS yöntemi ile tedarikçi seçimi ve tedarikçi risk değerlendirmesi)

In today's with the increasing complexity of supply chains, supplier relationships have gained strategic importance for supply chains. Long-term and sustainable supplier relations are important to gain a competitive advantage in the supply chain. It is also important that suppliers are selected according to KPIs, which enable the company to perform operational activities in line with supply chain strategies. To achieve a competitive advantage, all supply chain members must work collaboratively around common goals. The problems faced by the supply chain members can cause disruption in the whole supply chain. Therefore, it is important that firms take into account the risk factors that may arise from suppliers. In this study, a model has been suggested for the solution of the supplier selection and risk evaluation problem. Grey-based TOPSIS (Technique for Order Preference by Similarity to Ideal Solution) method was used to solve this problem because it is an effective method to solve uncertainty problems with discrete data. In order to evaluate the performance of the proposed method, a real-life case study is conducted in a Turkish textile company