The approach to use case modeling can be considered a top-down approach for SOA design, where service operations are identified based on where they are needed.

用于用例建模的方法可以视为SOA设计的自顶向下方法，服务操作基于所需的场合进行标识。

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Top-down analysis (through process modeling).

自顶向下分析(通过流程建模)。

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A business analyst's top-down modeling is a key element of the on demand business process life cycle methodology.

业务分析员的组织管理严密的建模过程是随需应变业务流程生命周期方法学的关键。

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Other common names for market timing include opportunistic investing, sector rotation, active asset allocation, top-down allocation, bottom-up allocation, global modeling, algorithmic positioning, defensive investing, and the list goes on.

FORBES: Anything But Market Timing