I recently had cause to re-read the Michael Porter classic ‘What is Strategy?’ [Harvard Business Review Nov-Dec 1996, pp. 61-78] – great of course on strategic positioning, which it contrasts with ‘operational effectiveness’, and while it describes OK the need for internal consistency in the ‘activity system’ that supports the strategy it says little about how that system actually works or how to steer its performance. … and I haven’t seen anything since that does address those issues.