Guideline: Maintain Business Analysis and Design Models
A business model evolves from an abstract representation into a concrete representation as understanding and formulating the business progresses. Maintaining multiple representations of the business can be worthwhile, depending on your needs.
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Main Description
Whether you choose to keep and maintain two models - a Business Analysis Model and a Business Design Model - depend on a number of considerations: if the Business Analysis Model is retained, must be maintained along side the Business Design Model - and this is costly.  If the business is stable, then the Business Analysis Model is useful because it allows technology decisions, which do not affect the more abstract business structure, to be revisited more easily.  If there is high organizational or functional churn - there might be less value, because the essence of the business changes and you need a new Business Analysis Model anyway.