Drucker's argument that effectiveness is a learnable discipline - not an innate talent - has made this slim volume one of the most enduring management books ever written. Cal Newport returns to it repeatedly, using Drucker's insistence that knowledge-worker productivity cannot be measured by activity to criticize modern pseudo-productivity in both Slow Productivity and A World Without Email.
Larry Bossidy and Ram Charan treat Drucker as the 'intellectual grandfather' of execution discipline, while Marcus Buckingham's Gallup research provides the large-scale empirical evidence for Drucker's principle that managers should build on strengths. The book's brevity and clarity are consistently praised - readers note that each chapter delivers a single actionable discipline - though some find Drucker's mid-century corporate examples require translation to modern knowledge-work contexts.