Eli Goldratt vs Taiichi Ohno: Theory of Constraints or Toyota Production System?
Comparing Eliyahu Goldratt's Theory of Constraints and The Goal with Taiichi Ohno's Toyota Production System: focus on the bottleneck versus elimination of waste, and when each applies.
Operations has two famous improvement philosophies with different centers of gravity: Eliyahu Goldratt's Theory of Constraints, introduced in the novel The Goal, and Taiichi Ohno's Toyota Production System, the root of lean. People compare them to decide where to focus when a process is slow, costly, or late.
What is the core difference?
Goldratt's central claim is that every system has a constraint that limits its output. Improving anything else does not improve the whole. The job is to identify the constraint, make the best use of it, align everything else to it, and then lift it.
Ohno's central claim is that waste hides everywhere, and that a smooth flow of work, with problems exposed and fixed at once, makes the whole system better. The job is to see waste and remove it continuously.
One says find the one thing that limits you. The other says find everything that wastes you.
What does Goldratt say?
Eliyahu Goldratt was an Israeli physicist who turned to business. The Goal (1984), written with Jeff Cox, tells the story of a plant manager who learns to see bottlenecks. The Theory of Constraints grew from this and from Goldratt's earlier scheduling methods. Its tools include the five focusing steps, drum-buffer-rope scheduling, and throughput accounting.
Goldratt wrote further novels and books, including Critical Chain (1997) on project management. He died in 2011. His style is argumentative, and the novel format dramatizes his reasoning.
What does Ohno say?
Taiichi Ohno developed the Toyota Production System at Toyota. His book Toyota Production System, published in Japanese in 1978 and in English in 1988, describes just-in-time production and jidoka, in which processes stop when problems occur. Key concepts include kanban, the seven wastes, leveling of production, and asking why five times.
Ohno regarded overproduction as the root waste because it creates inventory and hides problems. He insisted that managers go and see the work. TPS inspired lean manufacturing as it spread beyond Toyota.
How do they compare?
| Dimension | Goldratt | Ohno |
|---|---|---|
| Central idea | Output is limited by the constraint | Waste hides throughout the system |
| Method | Five focusing steps; drum-buffer-rope | Just-in-time, jidoka, kanban, seven wastes |
| Focus of improvement | The bottleneck first | Continuous reduction of waste everywhere |
| View of local efficiency | Misleading; builds inventory | Overproduction is the worst waste |
| Format | Business novel and books | Engineering practice and a book |
| Main risk | Ignoring waste outside the constraint | Waste hunting that misses the real bottleneck |
| Best known for | The Goal (1984, with Jeff Cox) | Toyota Production System (1978; English 1988) |
When does each one fit?
Goldratt's approach fits when output is stuck and one step visibly limits the whole: a machine with a queue, a team everyone waits for, a review stage. The method focuses effort where it counts.
Ohno's fits when delays and costs arise from many small sources: waiting, rework, motion, excess inventory, and unclear handoffs. The method builds the habit of seeing and removing them.
If a bottleneck is obvious, start there. If you cannot tell where the limit is, a flow study of waste may reveal it.
What does this look like in practice?
A software team ships slowly. A Goldratt-style analysis asks where work queues up: if code review is the constraint, the team ensures reviewers are never idle, protects their time from other work, and stops other stages from piling more work in front of them. Adding developers upstream only grows the queue.
An Ohno-style analysis maps the whole flow and finds waste: waiting for approvals, rework from unclear requirements, features built and never used. The remedy is a series of improvements across the flow. A team often discovers that the biggest waste is also the constraint, and the two methods meet.
"Our process is [describe steps and where work waits]. First, using Goldratt's five focusing steps, tell me where the constraint probably is, how to exploit it, and what to subordinate to it. Then, using Ohno's seven wastes, list where waste appears in the whole flow and which of those wastes sit at or next to the constraint. Recommend what to do first."
Why it works: the constraint tells you where improvement matters, and the waste list tells you what to fix there.
Can you use both together?
Yes, and many improvement programs do. Constraint thinking gives priority, and lean thinking gives methods for improving the constraint and the rest. Neither requires giving up the other.
The danger in both is mistaking a method for the whole. Mapping waste forever without raising throughput, or exploiting a constraint while ignoring quality, are failures of balance.
"Here are the performance measures we use for each team or machine: [list]. Using Goldratt's critique of local efficiency and Ohno's concern about overproduction, tell me which measures encourage building excess work in progress, and suggest replacement measures that reflect the whole system's output."
Why it works: both authors see local efficiency measures as a common cause of excess inventory and delay.
For a related comparison, see W. Edwards Deming vs Taiichi Ohno.
Where to go next
Eli Goldratt and Taiichi Ohno both sit in the Operator & Systems category. For the originals, read The Goal by Goldratt and Jeff Cox and Toyota Production System by Ohno. To find where a working process leaks time, money, or quality, Process Audit is a $99 tool built for it.
Frequently asked questions
Who wrote The Goal?
The Goal: A Process of Ongoing Improvement (1984) was written by Eliyahu Goldratt with Jeff Cox. It is a business novel in which a plant manager learns to find and manage bottlenecks. Attribution to both authors is accurate, and the ideas are Goldratt's. The format of a novel made the theory of constraints accessible to many managers who did not read operations textbooks.
What are the five focusing steps?
In the Theory of Constraints, they are: identify the system's constraint, decide how to exploit it, subordinate everything else to that decision, elevate the constraint, and repeat if the constraint moves. The method applies to production lines, projects, and services. Its premise is that a system's output is limited by its tightest bottleneck. The steps are often described as a loop, since improving a constraint tends to reveal the next one.
How do their views of efficiency differ?
Goldratt criticized local efficiency measures, arguing that keeping every resource busy builds inventory in front of bottlenecks and does not increase system output. Ohno also opposed overproduction, which he called the worst waste, and favored flow pulled by demand. Both reject maximizing the utilization of each station, and they arrive there through different reasoning. Goldratt drew on this criticism to argue for measures such as throughput, inventory, and operating expense in place of local efficiency.
Are lean and the Theory of Constraints rivals?
They are often presented that way, but many practitioners combine them. Lean attacks waste throughout a system, and the Theory of Constraints says to direct improvement at the constraint first. Each has advocates who claim primacy. The documented work of Ohno and Goldratt does not require choosing, and the two fit together in many plants. Some advocates call the combination lean-TOC, but the details vary from plant to plant.
Which is easier to start with?
Goldratt's approach starts with a single question about where the bottleneck is, which can give quick focus. Ohno's requires broader study of the whole flow. A small team with a visible bottleneck might begin with the constraint. A site with widespread delays might begin with mapping the flow and waste. Whichever you begin with, check the result against overall output and lead time, not local measures.
Does this apply outside factories?
Yes, with adaptation. Constraint thinking has been applied to projects, software delivery, and service queues, and lean ideas have spread to software and healthcare. Both need care in translation, since not every process has the physical flows that gave rise to the ideas. Look for the equivalent of work-in-progress and bottlenecks in your setting. It can also help draw a simple flow diagram to find where queues form.
Written by Gareth Hoyle. Last updated 8 October 2026. Part of the authority.md guides library.
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