A company's realized strategy evolves from one version to the next due to

a$.$ the importance of keeping the company's business model fresh and up$-$to$-$date.

b$.$ pressures from shareholders to boost profit margins and pay higher dividends.

c$.$ ongoing turnover in the managerial and executive ranks $($new managers often decide to shi to a different strategy$).$

d$.$ changing management direction because of understanding several appealing strategy alternatives.

e$.$ the proactive efforts of company managers to improve the current strategy, a need to respon to changing customer requirements and expectations, and a need to react to fresh strategic maneuvers on the part of rival firms.