The thing is, continuity of strategic direction and continuous improvement in how you do things are absolutely consistent with each other. In fact, they're mutually reinforcing.

wiley. Porter M. Criticisms
Porter has been criticized by some academics for inconsistent logical argument in his assertions.

Michael Eugene Porter (born May 23 1947) is the Bishop William Lawrence University Professor at Harvard Business School. Michael Porter’s work is recognized in many governments corporations and academic circles globally.