This book is not for the feint of heart, but if you are working on any kind of code fragment - HyperCard Externals, Photoshop Plugins, system extensions, control panels, list/control/window definitions, or QuickTime-style components - then there is certainly a gem or two in here for you. The book does need to be updated to reflect some changes in the Mac system architecture (e.g. the Code Fragment Manager for 68K), and the version of CodeWarrior included on the CD is multiple generations obsolete. But the actual source code and projects still contain many useful concepts.