The first edition of Systems Thinking was the first book to develop a working concept of systems theory and to deal operationally with systems methodology. The author has been working for the last 5 years to incorporate parallel development in quantum theory, self-organizing systems and complexity theory, the sum of which is included in this new 2nd edition. He has tested these concepts with 200 executive MBA students, and also with Russell Ackoff, one of the founding fathers of systems thinking. Ackoff reported that it was the most comprehensive systems methodology he has seen.