Friends, based on the questions I get, and some of the posts I see on the various automation websites and email discussion lists and web forums, reading a piping and instrumentation diagram is becoming a lost art. Unfortunately, it is a required skill for automation professionals, so I am pushing something from ISA that I think you should make required study for anybody who works for you-- and if you can't read a P&ID drawing-- for you.
Don't depend on your company to buy you this study guide either. Just go buy it.