Creating Value by Design: Thoughts and Facts
I find this book to be one of the best recounts of product design methodology written for designers in a designer's language. It goes further than just presenting design theory. In Volume I, the thoughts and theory is presented and in Volume 2 the results of applying the theory are shown. This is not just a book that presents you with a dry theory. It basically tells you the how and the outcome of the design process in two beautifully designed volumes. —Victor Papanek
This book is available for purchase.