I am an electrical engineer and PE, designing control systems. Although, I have not read this book cover to cover, it is setting on my desk and I use it frequently as a reference. It is an excellent source for creating electrical drawings, whether you are fluent in schematic generation, or just getting started. It contains information at all levels of understanding. I borrowed it from a CAD designer I work with, and it appears to be written for CAD designers. I have looked for a reference book of this nature- they are very hard to find. The reason I am writing this review is I came to amazon.com to buy it- a definite necessity for my professional library!