a book about explaining in a different way GoF patterns, given several examples (use case) by pattern, this way providing a better explanation for each one, this means a leverage for a better understanding, and promoting GoF to a reference book.
A good approach used is to ask himself about different situations, including boundary cases and how each pattern may help or even not help (clarifying common misunderstanding).
A great companion book for Gof, and even Gof becomes as a reference book whereas DPA becomes the book to read.
