I have a more thorugh review on my website. But let me just say, that I really enjoyed this book a lot.
The central insight of the book (and systems thinking in general) is, that manipulation of a system can suppress or release some behaviour which is latent within the structure of a system. A system can cause its own behaviour.
It is easy to see, why such insights carry an important message to anyone wishing to manipulate a complex systems into a desired state, such as architects, organisational designers, or business process designers. The book urges us to consider systems thinking complementary to reductionistic analysis, not throwing either of the paradigms out with the bathing water.
I usually don't comment on the appendix on the book, but in this case I will make an exception; the appendix is excellent and containts both a very useful glossary, as well as the main points of the book in bulletpoints.
This book is an extremely interesting read, and in particular relevant for people dealing with changes in complex structures, such as organisations, architectures, or business processes. For some readers, this primer will be a complete eye opener, changing the way the world is seen, For other, the will start to give them a vocabulary and a framework for understanding what they already knew by intuition.
The book provides a lens for understanding systems - and an excellent at that!