The Theory of Constraints (TOC) is a management philosophy that views any managed system as being limited in achieving more of its goals by a very small number of constraints. The core of TOC is that organizations should identify their constraints, then restructure and subordinate other processes to ensure the constraint is utilized as much as possible. The five focusing steps of TOC are to identify the constraint, exploit it, subordinate everything else to it, elevate the constraint, and then identify a new constraint as the original one is broken. Real-world examples demonstrate how manufacturers have applied TOC principles like buffers to actively manage constraints and continuously improve throughput.