Building the Data Warehouse

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required for the building of each deliverable is multiplied by each deliverable, yielding an estimate of the employee resources required.


SDLC/CLDS


Earlier discussions alluded to the fact that operational systems are built under one system development life cycle, and DSS systems are built under another system development life cycle. Figure A.14 shows the development life cycle associated with operational systems, where requirements are at the starting point. The next activities include analysis, design, programming, testing, integration, implementation, and maintenance.


The system development life cycle associated with DSS systems is shown by Figure A.15, where DSS processing begins with data. Once data for analysis is secured (usually by using the data warehouse), programming, analysis, and so forth continue. The development life cycle for DSS data ends with an understanding of the requirements.


the classical system development lifecycle











physical

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