Tedarikçi değerlendirmesi için kalite fonksiyonu yayılımı ile veri zarflama analizi entegrasyonu

In todays competitive market environment, organizations aim to respond to the fast-changing needs of customers as soon as possible. In order to achieve this goal, supplier performaces also play a key role as well as company?s own operations. Quality function deployment (QFD) is a technique which helps to meet the customer requirements in each step of supply chain by developing products and services for assuring the supplier satisfaction. This paper aims to propose a comprehensive methodology for supplier evaluation that enables customer requirements (CRs), buyer firm? s technical capabilities (TCs) and supplier characteristics (SCs) that companies request from suppliers to be taken into consideration. Data envelopment analysis (DEA) models are applied in three stages using the information from interrelated house of quality (HOQ) matrices and quantitative performance criteria to compute the efficiency scores of suppliers. The verbal assessments of decision makers are included in the decision process throughout the proposed methodology by utilizing the fuzzy set theory. In the developed approach, evaluation criteria are derived from the customers requirements, technical capabilities of firm, and supplier characteristics using a series of house of quality matrices. House of quality matrix, which translates the customer requirements into technical attributes of company, has one the most widespread applications in QFD process. Qualitative assessments made by a joint evaluation of decision making team, are subsequently translated into mathematical expressions by utilizing from fuzzy set theory. Further, a special variant of DEA model, which can take into account crisp and fuzzy data, is introduced to determine the importance weights of criteria at each step and the performance ratings of suppliers at last. Finally, the effectiveness of the proposed approach is supported by a real case study that pertains a pharmaceutical logistic company founded in Turkey. After the evaluation stage, managers individually arranged meetings with their suppliers to take corrective actions considering the results of the proposed methodology. The initial improvements after taking corrective actions are presented throughout the case study.