Theory of Constraints (TOC) is the overarching management philosophy developed by eliyahu-goldratt over more than two decades. Its central premise is that any system aimed at a goal has at least one constraint — a limiting factor that determines the system's output — and that effective management means identifying and exploiting that constraint rather than pursuing local optimizations everywhere at once.
TOC emerged from Goldratt's work on the OPT production scheduling software in the late 1970s during the physics-and-opt-origins era at creative-output. The insights embedded in OPT's algorithms — particularly the observation that a bottleneck machine governed the entire plant's throughput — became the conceptual seed. With the publication-of-the-goal in 1984, co-authored with jeff-cox, Goldratt brought these ideas to a mass audience through the vehicle of a business novel.
The five-focusing-steps form the operational core: a repeating cycle of identifying the system's constraint, exploiting it fully, subordinating everything else to that decision, elevating the constraint if needed, and returning to step one. This cycle distinguishes TOC from static optimization: once one constraint is broken, another emerges, so management is an ongoing process of finding and managing the binding limit.
throughput-accounting provides TOC's financial lens, replacing traditional cost accounting with the measures of Throughput, Inventory, and Operating Expense. A key insight is the distinction between policy-constraints and physical constraints — in most organizations, rules and metrics are the binding limit, not machines or materials. The thinking-processes extend TOC into a general problem-solving toolkit applicable beyond manufacturing to any domain. Practitioners were trained through the jonah-program, named after the Socratic mentor in The Goal.
Over the domain-expansion-era, TOC was applied to project management (critical-chain-project-management), distribution, sales, finance, and strategy, all unified by the constraint-management logic first articulated in the-goal. The goldratt-institute (formally the avraham-y-goldratt-institute, founded 1986) carried this work forward, and tocico now serves as the professional body for TOC practitioners.