| Zusammenfassung: | abstract: the ias-system was designed and developed in order to provide a comprehensive software system for econometric modeling and corporate planning. this paper discusses the main objectives, problems and problem solutions in connection with the production of this software. the main topics are interactive systems (man-machine dialog, analysis of dialog, error handling), portability (standardization of programming languages, standard-conforming programs, semi-portable and non-portable modules), data organization (unique interface between application programs and data base, storage, retrieval and update of items, self-reorganizing data base) and reliability (design, structured programming, documentation, test).;
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