TheGoal, by EliyahuGoldratt.
Eliyahu Goldratt is also the author of TheGoal, ItsNotLuck, CriticalChain, The Race, The Haystack Syndrome : Sifting Information Out of the Data Ocean, and Theory of Constraints (newest book).
Other reference books are Goldratt's Theory of Constraints : A Systems Approach to Continuous Improvement by William H. Dettmer, The Measurement Nightmare : How the Theory of Constraints Can Resolve Conflicting Strategies, Policies, and Measures by Debra Smith, and Management Dilemmas : The Theory of Constraints Approach to Problem Identification and Solutions (The St. Lucie Press/Apics Series on Constraints Management) by Eli Schragenheim.
Deming and Goldratt by Domenico Lepore and Oded Cohen might also be of interest (Also see WilliamEdwardsDeming).