That said, occasionally major disruptions — such as mergers and acquisitions or intensified marketplace competition — can shake up the marketplace and require you to reassess your strategy.
Strategy is more stable and covers the long term view.  While a strategy may require minor adjustments along the way, its fundamentals should change little, if at all, in the course of a year. That said, occasionally major disruptions — such as mergers and acquisitions or intensified marketplace competition — can shake up the marketplace and require you to reassess your strategy. But that is the rare exception.