GRACOL
The General Requirements for Applications in Offset Lithography (GRACOL) is a wonderful resource for anyone that buys or specifies printing. This publication provides guidelines for offset printing that any printer could follow to promote quality printing through process control. For print buyers, this translates to print predictability.
GRACOL not only has a very useful Print Guidelines Chart, but also a plethora educational segments written for print buyers. Topics include the types of printing processes, proofing, ink technology, CTP, e-commerce, and much more. It's as useful for experienced buyers as it is the novice.
You can order the GRACOL publication online for a mere $9 a copy. www.gracol.com