In the last ten years, Decision Support System has been used for many applications such as evaluation, prediction, selection, and optimization purpose. The main objective of this study is to design and develop a Decision Support System (DSS) to assist project contractors in selecting the most appropriate scheduling technique as they start a new infrastructure project, having considered the appropriate factors necessary for taking such decision. Project contractors are keen to choose an appropriate selection for infrastructure projects because of their positive effect on project success. The research primarily focuses on early planning for infrastructure projects before starting the construction phase and specifically examines network-based techniques such and graphical-based techniques. A Decision Support System developed in this paper is simple to use and allows the contractor to consider all decision-relevant factors. Its practical application will benefit the contractor's decision making in the selection of proper scheduling technique for their infrastructure projects.