VDM '91. Formal Software Development Methods. 4th International Symposium of VDM Europe, Noordwijkerhout, The Netherlands, October 21-25, 1991. Procee [Paperback]

The proceedings of the fourth Vienna Development MethodSymposium, VDM'91, are published here in two volumes.Previous VDM symposia were held in 1987 (LNCS 252), 1988(LNCS 328), and 1990 (LNCS 428).The VDM symposia have been organized by VDM Europe, formedin 1985 as an advisory board sponsored by the Commission ofthe European Communities. The VDM Europe working groupconsisted of researchers, software engineers, andprogrammers, allinterested in promoting the industrialusage of formal methods for software development. The fourthVDM symposium presented not only VDM but also a large numberof other methods for formal software development.Volume 1 contains conference contributions. It has fourparts: contributions of invited speakers, papers, projectreports, and tools demonstration abstracts. The emphasis ison methods and calculi for development, verification andverification tools support, experiences from doingdevelopments, and the associated theoretical problems.Volume 2 contains four introductory tutorials (on LARCH,Refinement Calculus, VDM, and RAISE) and four advancedtutorials (on ABEL, PROSPECTRA, The B Method, and TheStack). They present a comprehensive account of the state oftheart.Description is our business.- Concurrent processes as objects.- The Larch approach to specification.- Formal specification in metamorphic programming.- Formalizing design spaces: Implicit invocation mechanisms.- On type checking in VDM and related consistency issues.- Combining transformation and posit-and-prove in a VDM development.- A case for structured analysis/formal design.- A model-oriented method for algebraic specifications using COLD-1 as notation.- A mechanical formalization of several fairness notions.- Specification and stepwise development of communicating systems.- Writing operational semantics in Z: A structural approach.- EZ: A system for automatic prototyping of Z specifications.- Z and high level Petri nets.- An approlC'