Download Formal Methods for Trustworthy Computer Systems (FM89): by Dan Craigen MSc, Karen Summerskill BA (auth.), Dan Craigen PDF

By Dan Craigen MSc, Karen Summerskill BA (auth.), Dan Craigen MSc, Karen Summerskill BA (eds.)

The 1989 Workshop at the overview of Formal equipment for reliable Com­ puter structures (FM89} was once an invitational workshop that introduced jointly repre­ sentatives from the study, advertisement and governmental spheres of Canada, the uk, and the USA. The workshop used to be held in Halifax, Nova Scotia, Canada, from July 23 via July 27, 1989. This record stories the actions, observations, thoughts and conclusions ensuing. from FM89. 1. 1 goal of Workshop the first function for containing FM89 was once to evaluate the position of formal equipment within the improvement and fielding of reliable severe structures. the necessity for this review used to be predicated upon 4 observations: 1. severe structures are more and more being managed through computers; 2. current options for constructing, assuring and certifying computer-based serious platforms are insufficient; three. Formal equipment have the possibility of taking part in an identical function within the devel­ opment of computer-based platforms as utilized arithmetic does for different engineering disciplines; and four. Formal equipment have had restricted effect at the improvement of comput- dependent platforms and assisting applied sciences. · The target of the workshop was once to accomplish the next initiatives: 1. determine the issues retarding the advance of reliable serious platforms; 2. ascertain the (potential) influence of employing formal equipment suggestions to the advance of reliable severe platforms; three. be sure the examine and improvement required to facilitate a broader ap­ plication of formal tools thoughts; 4.

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Additional resources for Formal Methods for Trustworthy Computer Systems (FM89): Report from FM89: A Workshop on the Assessment of Formal Methods for Trustworthy Computer Systems. 23–27 July 1989, Halifax, Canada

Example text

Wing viewed a formal system as a pair < L, C,. > where L is a language and C,. , a mapping between strings written in L). A language consists of symbols and a grammar that describes how to write sentences within the language. , modus ponens). A theory in a formal system < L, C,. > is a set of statements S, S ~ L, such that S is closed under the consequence relation C,. (S)). The notation S 1- A indicates that A is in the consequence relation of S. A structure < U, I > for a given language L consists of a universe U and an interpretation I.

Rushby's commentary during this session. Peter Neumann Dr. Neumann, as often happens when three speakers address the same topic, returned to many of the points of the previous speakers. He stressed the importance of taking a systems view when contemplating using formal methods to assist in engineering critical systems. He observed that often a fundamental and difficult problem for the systems engineer is determining "the least common denominator" of what is being asked. It is necessary to do this first, in order to decide how best to proceed with the design and engineering tasks.

Scherlis presented Table 7 to summarize the history of formal methods and to contrast this with his "optimistic" characterization of trends. , empirical (testing] / analytical (formal methods]) "Verified"; no software maintenance; small examples Documentation as key linking element Uniform target implementation technology Module Interconnect Formalisms; componentwise systems engineering No support for requirements engineering Early validation techniques; advance requirements frontier; iterative ("risk-driven") process models In the past, the formal methods community ignored maintenance, which is generally considered to be approximately 70% of the overall Department of Defense software effort.

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