Building the Data Warehouse

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■■ The requirements that have been gathered are complete, as far as it is reasonably possible to gather them.

■■ The requirements are organized.

■■ The requirements are readable, comprehensible, and at a low enough level of detail to be effective.

■    The requirements are not in conflict with each other.

■    The requirements do not overlap.

■    Operational and DSS requirements have been separated.

■    The output from this step is a formal requirements definition that is ready to go to detailed design.

PARAMETERS OF SUCCESS: A succinct, organized, readable, doable, quantified, complete, usable set of requirements that is also a document for development.

CA—Capacity Analysis

PRECEDING ACTIVITY: Sizing, phasing.

FOLLOWING ACTIVITY: ERD specification; functional decomposition.

TIME ESTIMATE: Depends on the size of the system being built, but with estimating tools and a focused planner, two or three weeks is a reasonable estimate for a reasonably sized system.

NORMALLY EXECUTED ONCE OR MULTIPLE TIMES: Once per phase of development.

SPECIAL CONSIDERATIONS: The capacity planning function has a history of confusing issues and including extraneous factors that do not merit special attention. It is important to keep the capacity planning portion of the development process focused and to the point. Otherwise, the exercise can become a roadblock to progress.

The gross amounts of resources to be consumed by the project being analyzed need to be estimated in this early phase of development. In particular, the following needs to be considered:

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