Abstract
A highly interactive programming system is presented which supports hierarchical and program development with abstraction mechanisms. By taking advantage of abstraction mechanisms, the system provides a truly modular environment, in which modules are constructed, debugged, verified, and compiled in a module-by-module fashion. Such an environment naturally requires system management of the information concerning ongoing program development, in the form of module databases. As a result, further problems arise as to how to modify the information in efficient and consistent ways. This paper discusses design objectives for programming systems by focusing on such issues as information management, interactive construction and modification of modules, separate processing, specification and verification, and supports for cooperative program development.
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