Eliyahu M. Goldratt
1947–2011
The theory of constraints, the five focusing steps, and the critique of local optimisation.
- 1947LifeBorn
- 1984WorkThe Goal
- 2011LifeDies
Eliyahu Goldratt (1947–2011) was an Israeli physicist who applied constraint analysis to manufacturing and management, producing the theory of constraints.
The theory of constraints
The central claim is that every system has one binding constraint at any time, and that the throughput of the whole system is set by that constraint alone. Improving anything else changes nothing. Work added upstream of a bottleneck accumulates as inventory in front of it; capacity added downstream sits idle.
His five focusing steps follow directly. Identify the constraint. Exploit it, meaning get the most from it without spending. Subordinate everything else to that decision. Elevate the constraint by adding capacity. Then return to the first step, because relieving one constraint moves it somewhere else.
The last step is what makes it a method rather than a fix. There is always a constraint; the work is knowing where it currently sits. See the bottleneck.
The Goal
He presented this in The Goal (1984) as a novel, following a plant manager with three months to save his factory. The form was deliberate: the argument concerns how managers reason about local efficiency, and showing someone reasoning badly and then correcting works better than stating the principle.
The book's sharpest target is local optimization. Measuring each station by its own utilization produces a plant where every station is busy and the factory ships late, because keeping a non-constraint busy manufactures inventory rather than output. See The Goal.
Influence
The ideas fed directly into lean manufacturing and later into software development, where queueing and work-in-progress limits rest on the same analysis. Goldratt extended the method to project management as critical chain, and the framework transfers to any system with a flow and a limiting step — including a sales pipeline and a founder's calendar.
Questions
What is the theory of constraints?
The principle that every system has one binding constraint determining its overall throughput, so improvements anywhere else produce no gain until that constraint is addressed.
What are the five focusing steps?
Identify the constraint, exploit it without new spending, subordinate everything else to it, elevate it by adding capacity, then repeat — because relieving one constraint moves it elsewhere.
Why is The Goal written as a novel?
Because its subject is how managers reason about efficiency. Showing a manager reasoning badly and then correcting conveys the argument more effectively than stating the principle directly.