Data: Everchanging and Eternally the Same - High-Performance Web Databases: Design, Development, and Deployment - page 573

towards gaining control of these mismatches — through central control
and through making business rules explicit.

• Lesson 1: if you are at the planning stages, always keep the underlying

atomic data — even if management is adamant about not wanting it.

• Lesson 2: You cannot provide an enterprise view without (central) en-

terprise control.

• Lesson 3: The more explicit you make the business rules the easier it

will be for business consumers of data to validate them on an on-going
basis — and thus make your life easier.

• Lesson 4: No matter how explicit you make the business rules, you'll

have to rewrite the systems every 10 years or so to force staff (both
business and IT) to rethink them all.