Weinberg distills the essence from von Bertalanffy's classic and manages to present it in a very accessible fashion. The book has been out of print for quite a while so it is great to see a new edition. The message and information contained in here, although originally published in 1975, is now more relevant than ever. Weinberg covers many aspects of systems theory beginning with the main stumbling block with the present scientific paradigm: the idea that the universe is mechanistic. His treatment is much more general than Robert Rosen's in "Life Itself" but still conveys why the mechanistic notion is flawed. He then outlines the general systems theory approach before leading into the idea that a system is simply a way of looking at the world. He then outlines the principle of indifference. This leads straight into two sections outlining various aspects of making observations. Finally he discusses behaviour and then some general systems questions. Throughout the book he uses many examples from disparate fields in conjunction with questions for further research. It is great to see someone who doesn't preach systems but actually uses the ideas. Definitely a must-read as we decided how to solve the myriad of issues before us.