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On Purposeful Systems provides an innovative foundation for looking at human and social behavioras a system of purposeful (teleological) events. It uses a systems theoretical approach for the study of these phenomena, and illustrates and extends general systems theory. What makes this book magical is that Ackoff provides operational definitions for many ill-defined words and conceptsfrom defining knowledge and understanding to providing definitions of feelings/emotions.... (T)his book represents a (paradigm) shift that has yet to be appreciated, thirty years later.W. Curtiss Priest, Massachusetts Institute of Technology