This book is split into three parts - 1) The need for creative thinking, 2) methods of lateral thinking and 3) applying creative thinking.
de Bono argues that brainstorming, while initially useful, is no match for the application of better creative thinking techniques. His work is built on the premise that the brain is a self-organising pattern-making system. His goal is not to improve the skills of artistic creativity but to deal with the creative skills that change concepts and perceptions via the behaviour of self-organising information systems. He argues that creativity is not just making things better but is a way to make full use of information and experiences.
Conclusion/Verdict - buy and study the previous work "Lateral Thinking" by this author first. Then, when you want to move on, buy this book - it is an excellent post-Lateral Thinking book.