Academic Structural Analysis Computer System, ASACS, is a general purpose computer software system for the analysis of plane trusses, plane frames, and plane grids. The geometry of the structure, the member properties, and the loads are provided by the user in a problem oriented language. Member forces, joint displacements, and reactions are produced in an easily understood tabular format. A linear, elastic, static, small-deflection stiffness analysis is used to calculate these values. ASACS is ideally suited to the analysis of small to medium-sized structures in a time-sharing or limited computer environment. Minimal storage requirement and computational time are features of ASACS that enable both student users and practicing engineers to obtain rapid turnaround and reliability in structural problem solution.