Specification and Formal Modelling Clause Samples

Specification and Formal Modelling. During pilot and enhanced deployment both systems were formally modelled with Event-B. During pilot deployment (cruise control) the Problem Frames model was taken as input for the formal specification in Event-B. Although we provided a mapping between problem frame elements and Event-B elements the formal modelling phase itself took around 4 months. The formal modelling phase consisted of translating the requirements stated in problem frames into Event-B models. Due to the different structure of the Problem Frames model and the Event-B model and the missing support for an architectural design in Event-B this process took considerable time. In order to speed up the formal modelling phase and to close the gap between the informal and the formal world, we decided to introduce another phase between requirements development in Problem Frames and formal modelling in Event-B, namely specification. During specification the requirements stated in the problem frame diagrams were modelled using RSML, a notation for state machines. Using this notation the effort for formal modelling in Event-B could be reduced from 4 months (120 days) to 6 weeks (45 days). Parts of this reduction have been made possible because the complexity of the formal modelling task was reduced to a task of simply translating the state machines described in RSML into Event-B events.
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