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Application GUI Forms GUI Commands GUI Controllers Rule scanner parser processor xx novice developers xx experienced developers Core Business Classes Archetype DB interface Database Application Framework Operating System 50 EE-TOOLS May 00 Engineering Business Systems in Eiffel DESIGN - THE CONCRETE MODEL The concrete model is the directly programmed logic and structure of the system. It relates to the meta-model and business rules as follows: • Some behaviours may be driven by the meta-model • Business rule processor attaches rules to objects at runtime, using a method-dispatcher or similar mechanism Note: the meta-model and rule processing are implemented using normal classes as well - they just model “meta-concepts”.

46 EE-TOOLS May 00 Engineering Business Systems in Eiffel ANALYSIS Process for producing analysis model: • Convert requirements BOM descriptions into concrete classes • Express constraints from BOM as class invariants • Define configuration data for system, based on requirements • Find/develop beginnings of grammar for expressing business rules; define business rules The last step above is often ignored, but is the basis for producing the meta-model. e. hard-coded) • Meta-model • Business rule language and processor The last two are optional, although not many non-trivial business systems would be without either.

Reverse engineered case diagrams, class interfaces • Markup or versioning for review • Can be command-line driven -> can use make to rebuild doc 40 EE-TOOLS May 00 Engineering Business Systems in Eiffel • Directly supports process workflow MCS experience: • Authoring was painful: Aolpress, MS Word, ABC Flowcharter, Powerpoint + graphic format converter • Review: ??? ) • Dissemination: intranet web • Integration at HTML level of Eiffel and Case output • Quality was acceptable Conclusion was that a better authoring alternative must be found next time around.

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