Over-training is an extremely common term used around here. Some people consider it paranoia, others regard it as the plague. Ultimately, we need to come to some sort of a collective agreement as to "our" approach to it in order to have a fundamental. My opinion of a fundamental is this; Take the top 100 athletes in a particular sport and find what they do in common, your answer list will undoubtedly be filled (not 100%) with things ideally suited as fundamentals.

Please not only answer the poll question, but discuss your personal definitions of failure, or agree that these terms are acceptable.

Pre-Failure - 1 rep short of likely failure.
Pos-Failure - Negative direction is controlled, positive is assisted.
Neg-Failure - Decent is assisted, positive is assisted.

Please also post your policy regarding failure in the following contexts;

Do you periodically go to failure?
How do you change your failure policy while on AAS?