Formal Requirements Engineering Using Observer Models

Today we are confronted with an enormous variety of formal software engineering approaches and tools. Among these are many that address the critical early stages of software development. However, only little attention has been paid to the integration of different specialised approaches and to the overall development process. In this paper we present a technique for formal requirements analysis (observer models) that deals with particular perspectives on a system rather than with particular aspects of it. A realistic gasburner example illustrates the overall approach.