This is probably the best technical book I read that was published in 2004. If you are struggling to see how you can apply patterns in your day-to-day work, this book will help. Most development work is done with existing code bases. It is less likely that you will have a chance to design something from scratch using design patterns that you are aware of. So this book helps you move toward a code base that is better designed in refactorings that lead to common design patterns. The author suggests that many systems are now "over-engineered" due to the popularity of design patterns. I have not had the opportunity to work on such a system, but the book was still very relevant. The code examples are actually very realistic and detailed, which I appreciated. Some readers may find them too complex and distracting from the refactoring steps, but I thought they strengthened the book. I read the book in the order suggested by the author to those who want to study the patterns. It worked very well and the code examples carried thoughtfully from one refactoring to the next. Examples are in Java but if you are using any OO language you will likely be able to follow them. Many technical books are filled with typos and grammatical errors. This book was obviously well edited and not rushed out the door to publish.