TOC or more formally the Theory of Constraints is a way of thinking about business problems that gets to the core constraint that creates many symptoms.
The idea was developed by Eliyahu Goldratt and first was famous in his book, The Goal, when he looked at production issues. he identified that making improvements away from the constraint created an illusion of improvement.
The system and its results were still limited by the constraint.
Theory of Constraints: Introduction To TOC
Guided Profit System Coaching Rich Schefren
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Eliyahu Goldratt Has Died - 11 June 2011
Books On The Theory Of Constraints
The Goal by Eliyahu Goldratt and Jeff Cox
It's Not Luck by Elihayu Goldratt
Reaching The Goal by John Arthur Ricketts
The Six Steps Profit Formula - Free Report (Click On Image)