Jeff Hirsch presented an excellent Judging Seminar in August of 2015. The following are the slides from that presentation:
This is a document that has been around awhile that provides some valuable information to help judges become familiar with the process.
A glossary of terms and descriptions for judging: ABC's of Art - Elements and Principles of Design
This document should be read and reviewed with non-club member judges by the person responsible for coordinating with the judge.