CF Dictionary · Theory of Constraints Terms
Theory of Constraints (ToC)
A methodology by Eliyahu Goldratt about how to think: focus on constraints (bottlenecks, limiting factors) for achieving goals.
Also: ToC, TOC, Goldratt
Theory of Constraints (ToC) is the philosophy of management and thinking developed by physicist-turned-management-consultant Eliyahu Goldratt. Goldratt's stated goal was "to teach the world to think well." He sold over ten million books and his ideas are taught in business schools worldwide.
His most popular book, The Goal, is a novel about a factory manager under pressure to improve performance. Goldratt's other books include It's Not Luck, Critical Chain, Necessary But Not Sufficient, and The Choice.
The Goal teaches five focusing steps
- Identify the system's bottleneck (the limiting factor).
- Exploit the bottleneck — get the most out of it without expensive changes.
- Subordinate everything else to the bottleneck — don't let non-bottlenecks dictate the system's pace.
- Elevate the bottleneck — make a real change to increase its capacity.
- Repeat — once one constraint is broken, find the new one. (Don't let inertia turn yesterday's bottleneck into today's local-optimum.)
Core ToC concepts CF uses
- Constraints / Bottlenecks / Limiting Factors — the slow part that the rest waits on.
- Global Optimum vs. Local Optimum — improving the big picture vs. improving a narrow part.
- Excess Capacity — when a factor has more capacity than the system needs.
- Throughput — the rate at which the system generates its goal (usually money).
- Variance — fluctuations in real-world performance.
- Buffers — extra capacity or inventory placed in front of a constraint to keep it fed.
- Silver Bullets — simple, high-leverage solutions found by inherent-simplicity.
- Win/Win Solutions — resolving problems by removing a false conflict rather than compromising.
- Balanced Plant (anti-pattern) — designing every workstation for 100% utilisation, which is worse than designing around the constraint.
- Five Focusing Steps — the iterative process above.
- Tree diagrams — Goldratt's trademark tool for organising conflict and cause analysis (cf. idea-tree).
Why CF cares about ToC
ToC is one of CF's three source traditions because it gives a precise way to think about which factors deserve your attention. Most factors aren't borderline — they're either obviously sufficient or obviously insufficient. ToC says: focus on the constraints, not on the easy parts. CF combines this with CR's error-correction epistemology and Objectivism's cognitive integration to get a full philosophy.
"Along with Critical Rationalism, Theory of Constraints is one of the main philosophies that Critical Fallibilism builds on." — criticalfallibilism.com