Abstract
Boehm has recently suggested a spiral model for software development and enhancement, which has achieved considerable recognition. The purpose of the two-part article is to contribute to the spiral model in three respects: to develop its theoretical basis, to introduce a hierarchical spiral model based on three levels of modelling for an information system (IS) and software (SW) product, and to develop the idea of the spiral model as an integrative framework that can incorporate more specific and detailed IS and SW development approaches. Part 1 introduces the sociocybernetic metamodel for IS/SW design and the hierarchical model for an IS/SW product as a theoretical background for the hierarchical spiral model to be introduced in Part 2.
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