This book is geared more towards a beginner, on "how to develop a schematic diagram" or "how to read a schematic diagram." This is prompted by the title of this book "Schematic Diagrams The Basics of Interpretation and Use." However, I felt that the author could have included a larger variety of schematic symbols as it's hard to find a great book with the 'right' symbols for me to use in drafting.
I'm glad this book cost me under $20.00 used, as I don't feel I have any use for it.
