This book is a complete waste of time if you are actually trying to design and implement a system for the first time. Almost every section covered ends with, installation details regarding equipment and wiring will depend on the manufacturer. Which is of course true, but that should not have prevented the use of concrete examples of test systems that specify how one could create one of these systems would have been much more useful for someone attempting to implement an access control system for the first time. If all you are looking for is a general overview of different doors, conduits, wire ratings, and types of access control with no actual examples of how to implement said products into a working system, then this is the book for you. If you are like me and trying to create an actual system, this was a waste of time.