Abstract

Information systems are specified, designed, and implemented (or acquired) to solve business problems. Therefore all stakeholders of a solution should have demonstrably the same understanding of the problem. Since a problem exists only within the context of its domain, demonstrably the same understanding of the domain by all stakeholders is essential to understand and specify the problem and, then, to specify its solution possibly using an information system. This entry describes a small, elegant, and effective system of abstract and precise concepts for business (and IT) domain modeling that has been around for a long time and that has been successfully used, in particular, to bridge the proverbial gap between business and IT stakeholders. Two non-toy examples are presented.