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Formal Engineering Methods, International Conference on (2000)
York, England
Sept. 4, 2000 to Sept. 7, 2000
ISBN: 0-7695-0822-7
pp: 143
R. Banach , Manchester University
M. Poppleton , Manchester University and Open University
ABSTRACT
Retrenchment is presented in a simple relational framework as a more flexible development concept than refinement for capturing the early pre-formal stages of development, and briefly justified. Fragmented retrenchment permits the granularity of actions to decrease across a development step, many concrete steps retrenching a single abstract one. This generates the usual proliferation of inter-leavings of events at the concrete level. Event structures, particularly flow event structures, help to control these within the retrenchments of a single abstract step, while the concurrent reading of the fragmented retrenchment proof obligation permits acceptable inter-leavings of retrenchments of different steps. It is observed that retrenchment allows the convenient description of unfair behaviours when fairness is not guaranteed.
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CITATION

R. Banach and M. Poppleton, "Fragmented Retrenchment, Concurrency and Fairness," Formal Engineering Methods, International Conference on(ICFEM), York, England, 2000, pp. 143.
doi:10.1109/ICFEM.2000.873814
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