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This thesis reports on an effort to design and implement a modern interactive computer-aided design and analysis package for control systems. This package applies to discrete and continuous time systems. The thesis effort continues the effort begun by Captain Glen T. Logan who used a control engineering design and analysis computer program called TOTAL as his starting point. This thesis project uses top-down structured analysis and programming techniques to define the new program called ICECAP (Interactive Control Engineering Computer Analysis Package). A user-oriented command language forms the basic structure. of ICECAP. On-line assistance is provided to the user. The program makes use of CRT (Cathode Ray Tube) terminals with a limited graphics capability to improve the user environment. The program structure allows features to be added in a modular fashion so that others can continue the effort. Emphasis was placed on implementing the continuous time functions first. (Author)