© 2019 by the American Institute of Aeronautics and Astronautics, Inc. All rights reserved.During rocket/missile system design process, system design must be made in accordance with military standards, which have very strict rules. Product delivery dates usually are very rigid. Despite this, during conceptual design, requirements are often updated within the design process that requires the design to be updated frequently. It is essential to perform these steps as efficiently and quickly as possible. The products which are inexpensive and have best performance parameters are preferred, and so the companies with these products can survive. For this purpose, the conceptual design, which is the first step of the system design process, needs to be optimized. In this study, it is aimed to develop a system design tool that simplifies the conceptual design process, creates design alternatives quickly, tests them, performs performance analysis, and selects the optimum among these alternatives. By using this tool, it is possible for the designer to obtain the information needed for the preliminary process quickly and efficiently.