Russell Ackoff's long and distinguished career as the doyen of Design and Systems Thinking was built around a collection of deceptively simple-but often overlooked-principles and observations. In Differences That Make a Difference-the last of his many books-Ackoff determined to distill the wisdom of a lifetime into a "glossary" that would be easily accessible to managers, employees, students, and academics alike. His aim was to dissolve (not solve...