The objective of this thesis is to develop a Decision Support Model (DSM) for the supplier selection process in the purchasing process. Multiple Objective mixed integer linear Programming (MOP) model is developed for the selection of suppliers. The application of Data Envelopment Analysis (DEA) as a tool in the supplier selection process is demonstrated. The model that is developed is tested with the data collected from a manufacturing firm. The model developed supports the decision-maker in the supplier selection process as well as aids the decision of splitting the order quantity between the selected suppliers.
