How are the two approaches namely strategic planning and scenario planning different from strategy-as-planned-emergence approach?

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Strategic planning was the first framework, before scenario planning was introduced, and strategy as a planned emergence model is the most recent addition. The first two are relatively formal, "rational" top-down planning approaches. Although the third approach also begins with a strategic plan, it is a less formal and less stylized approach to the development of strategy.

How Are the Two Approaches Namely Strategic Planning and Scenario