Titlebook: Specification and Development of Interactive Systems; Focus on Streams, In Manfred Broy,Ketil Stølen Textbook 2001 Springer Science+Busines

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Specifications,cification can be syntactically transformed into a standard FOCUS specification describing the required behavior directly by a logical formula on timed streams. Thus, the frames and styles do not increase the expressive power of FOCUS, but help to improve the structure and readability of specifications.

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Access Control System,. Thereby we demonstrate the suitability of the equational style in a more realistic context. A specification of the ACS first appeared in [BH93], from which we have adapted the following informal specification.

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Refinement,plement another specification. In the guided tour of . we already touched on this matter. In this and the following three chapters, we introduce, explain, and define refinement in a much more careful manner.

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Introduction,arts — called hardware, and of programs — called software. The programs are executed on the hardware. Typically, interactive systems consist of a set of components cooperating and exchanging information through interaction. In most cases, the interaction among the different components is rather soph

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A Guided Tour,a guided tour through the Focus method. We briefly explain the most central concepts and notations, we demonstrate the specification and refinement techniques, and we show that Focus Supports a classical stepwise development. Since the task of this chapter is to give a first introduction to FOCUS, t

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Examples,les. It also introduces the basic FOCUS constructs and notations for writing specifications. In this chapter we apply the basic specification formalism of FOCUS to describe components from the following three application areas.

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Properties of Specifications,ies. Classification of system properties provides valuable insights and input to systems development. First, the understanding of the system to be developed is increased. Second, different classes of properties often require specialized description and verification techniques. Third, the stepwise co