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G. Interleaf, PageMaker etc 41 EE-TOOLS May 00 Engineering Business Systems in Eiffel Technical Architecture 42 EE-TOOLS May 00 Engineering Business Systems in Eiffel ARCHITECTURE - GOALS A reminder of what we are trying to achieve in the “big picture”: • Economically viable • Quality How: • Seamless architecture • Internal (micro) reuse • Enterprise (macro) reuse • Economically extensible 43 EE-TOOLS May 00 Engineering Business Systems in Eiffel REQUIREMENTS Keys for structure: • Comprehensive structure right from start (example) • Use traceability markers in the text • Keep in CM system, and keep updating Continual update and review is essential, because errors at the requirements level cost orders of magnitude more to rectify than errors at the design or implementation levels.

Make sure the requirements: requirement is understood! g. due to enterprise database “standard”) ++++++++ live schema object/relational schema mapping & software layer 62 EE-TOOLS May 00 Engineering Business Systems in Eiffel Most of the talk about the object/relational problem relates to D above. But many systems only need to do B or C. The architecture for B and C is: SQL OO app w. odl schema) • Class design Using an object database impacts on the design of classes, and requires a certain amount of intelligence.

In particular, care must be taken with: • Business objects are composed of prog. lang.

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