Object Oriented Design

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By Roy Maclean, Visit Amazon's Susan Stepney Page, search results, Learn about Author Central, Susan Stepney, , Simon Smith, Nick Tordoff

This article describes and explains the ORCA (Object-oriented requisites trap research) procedure. it truly is aimed toward these attracted to the outline and research of complicated platforms. specifically, it truly is geared toward these accountable for generating techniques for using info know-how and necessities for software program improvement. generating and interpreting versions of platforms is a chief task in ORCA and complementary modelling languages are supplied for this goal. those languages are illustrated through the e-book.

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This boundary must encompass all areas that may be subject to change and development. The initial problem presented by our NIMWeC client is expressed in terms of problems associated with the control boxes for the looms. These are expensive and unreliable, and the client wants to replace them with a new control system in order to be able to expand production by operating more looms. So, the manufacturing process is to be our primary area for investigation. However, after discussion, we agree with the client that the scope of analysis should be widened to include NIMWeC’s interactions with its customers and suppliers.

The analysis, if done in full, would provide a firm basis for proceeding into IT systems development. The next chapter summarises the key ideas of ORCA, and presents them in the context of this example. 1 An analysis process needs to be tailorable Different analysis situations require different analysis processes. In some situations, particular aspects of the analysis process need to be emphasised, while other aspects are de-emphasised or omitted altogether. It is not necessary, or even desirable, to use all of ORCA on every analysis!

ORCA by example by the new operation. Some time later, when the ‘trigger condition’ holds, the FDC creates an Order . Notice how this behaviour links the previously modelled Transaction and OrderDelivery behaviours, and shows what it is that creates Order s. If this were a real analysis, there would of course be much more detail and supporting information in the statement of requirements. 6 25 Change and development Having produced a sufficiently precise statement of requirements, we have reached the end-point of the analysis process.

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