This book is written in a clear and straightforward way, but I found it challenging and it took me a while to finish, mainly because many of the ideas Bohm and Peat advance are unorthodox and subtle. In other words, this is a book about creativity and the authors are themselves quite creative.
You need to read the book in full to follow the lines of reasoning and engage with the many rich examples, but let me try to provide a summary of what I took to be the key ideas:
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Rigidly inflexibility in our thinking and interaction leads to fragmentation, maladaptiveness, and destructive tendencies in our individual and social lives, including in science. This inflexibility is perpetuated by tendencies to specialize (thus ignoring wider contexts), denial of the existence of problems, ignoring implicit assumptions, ignoring and downplaying important questions, holding out unwarranted hope for failing paradigms, selective use of evidence, and forcefully imposing inaccurate ideas (reinforced by social consensus).
Creativity is a proper means to overcome inflexibility and its consequences, and is a natural need of humans and a natural expression of the universe. Creativity can be achieved through a variety of approaches: free and open-ended play of the mind, willingness to ask questions and challenge assumptions, use of metaphors, avoidance of inflexible reification of categories, working with a simultaneous plurality of hypotheses and allowing them to dynamically interact and evolve, sincere and respectful dialogue, giving ideas and theories gestation time before judging them, interdisciplinary coordination, interpreting theories (ascribing meaning to them) within broader contexts, sensitivity to the artistic (not just aesthetic) aspects of theories, appreciation of different levels of order and unfolding of extrinsic order from "hidden" generative and implicate orders, and engagement with other cultures and subcultures. To be effective, creativity must also be sustained, rather than intermittent or limited to paradigm shifts, and creativity must be applied to the whole of life, not just specialized areas such as the arts and sciences.
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I find the ideas advanced in this book to be very sensible, and I think the need to adopt a creative attitude and approach is even more pressing today than when this book was written more than two decades ago. I therefore highly recommend this book to anyone who senses the need for genuine creativity in science as well as the rest of personal and social life. David Bohm was highly accomplished as both a scientist and a philosopher, and was surely one of the great thinkers of the 20th century, so his books are not to be missed (no offense to Peat, but it's hard not to be overshadowed by Bohm).