This book is definitely for advanced programmers who wish to incorporate core data into their work. I am still learning Cocoa and Mac programming after a long hiatus. There are some mistakes in the book and without some background, novices (like myself) would be clueless as to how to fix them. Thankfully, there is a web site posting the errors and omissions to get one back on track. About half of the chapters are related to core data with the remaining discussing how to use core data with other Apple technologies: Spotlight, iPhone, multithreading, etc. If you're looking for great insights to core data that will make it easier to understand, you should probably skip this book.