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Potential Operations (Actions) • Expert to page: when an alarm appears (what’s involved? alarm operator and system) • Expert is on duty: check when on duty (what’s involved? expert and system) 22 Validated Designs for Object-oriented Systems • Number of experts on duty: presumably given period (what’s involved? operator and system) These constitute a kind of elementary dictionary of the main terms used in the requirements. It is often advisable to create a dictionary before starting to sketch models, in order to identify similarities and redundancies before beginning to use tool support.

Add the information about some of the operations from Chapter 2 in this way. Note that, because adding this kind of information at the Rose level requires a lot of clicking and selecting with the mouse, most users prefer to add the signature details at the VDM++ textual level and then have the appropriate information inserted in the correct places automatically. The changes made to the operation signatures may not be visible directly in your class diagram. This is because Rose has different ways of filtering how much information one would like to have in a diagram.

Again, check the model’s consistency in VDM++. Complete the class (and data type) definitions by determining potential invariant properties from the requirements and formalising them. Complete the operation definitions by determining pre- and postconditions and operation bodies, modifying the type definitions if necessary. Validate the specification using systematic testing and rapid prototyping. Implement the model using automatic code generation or manual coding. 5. 6. 7. 8. 9. 10. As indicated in Chapter 1, this book focuses on design rather than requirements analysis.

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