6th Refinement Workshop: Proceedings of the 6th Refinement by David Garlan (auth.), David Till MA (Oxon), MSc (eds.)

By David Garlan (auth.), David Till MA (Oxon), MSc (eds.)

The 6th Refinement Workshop happened at urban collage in London from fifth to seventh January 1994. the current quantity contains the entire papers which have been submitted and accredited for presentation, including papers by way of invited audio system. The workshops within the sequence have typically happened at 365 days durations yet during this final case a yr interval had elapsed. those workshops have validated themselves as a massive occasion within the calendar for all people who find themselves drawn to growth within the underlying idea of refinement and within the take-up by means of of the tools supported by way of that concept. one of many proposed subject matters of the 6th workshop used to be the reporting of winning adoption in of rigorous software program improvement equipment. The programme committee was once possibly somewhat disenchanted by way of the reaction from to the decision during this appreciate. even though, the new interval can be characterized as one in every of consolidation, while these businesses that have made the choice that formal improvement tools are vital to their enterprise were adopting them the place applicable and discovering them to be useful. at the different hand,. the tough economic system which exists in so much components of the built international might be now not the context during which businesses nonetheless doubtful concerning the merits are goil'\g to pick out making significant alterations of their operating practices.

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Additional resources for 6th Refinement Workshop: Proceedings of the 6th Refinement Workshop, organised by BCS-FACS, London, 5–7 January 1994

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Furthermore, Mealy-Automata can not output when they are initialized. Example 6 (Specification of a control transformation) We now give an example of a control transformation A which is specified by the state-transition-diagram STD A and also by the equivalent automaton MA: Control Transformation: STDA: Axiom 1 Assume II, II' are states of the set of flows I U 0, u and u' are states of the control transformation (fl, u representing the states before and II' u' after the processing of A), in E I (the value along in causes the processing) and out ~ 0 (the flows of out carry the output), so that the following conditions hold: 1.

198-210, Febr. 1986. [WM85] Paul T. Ward and Stephen J. Mellor Structured Development for Rea/Time Systems (3 vols), Yourdon Press Computing Series, Prentice-Hall, Englewood Cliffs, 1985. P. G. Wood Comparative Evaluations of Specification Methods for Real- Time Systems, draft, September 1989. Submitted Papers Improving the Process of System Specification and Refinement in B K. Lana, H. Haughton Lloyd's Register, Croydon, UK Abstract This paper describes systematic appmaches to the formalisation and refinement of domain and analysis models in the B Abstract Machine Notation (AMN).

1. ' if I = in , if lEO 28 (b) The result of the processing of the transformation is: '(A) _ { u(A) , if II(in) = ENABLE /I. /in] and out = 0 holds. u'(A) = ZA, ifll(in) = ENABLE /I. u(A) = DISABLE. /in] and out = AnfA holds. 1.. 2 Axiom for data transformations In the following we present the axiom for data transformations. A data transformation is represented syntactically by Dtra(A, I, 0, Sp), where Sp denotes all stores, which can be written or read by the data transformation. With every data transformation relation 1A a state is associated.

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