What is the Coupling Gap?
The distance between the highest technology gate a company has passed and the lowest manufacturing gate it has passed. A company at TRL 7 with a manufacturing capability readiness (MCRL) of 3 carries a Coupling Gap of 4. That is not a technology problem, and no amount of technology diligence will surface it.
Why the gap needs a name
Technology readiness has levels, gates and a shared vocabulary that any investment committee can read. Manufacturing readiness does not travel the same way. So diligence measures one ladder carefully, assumes the other, and prices the company on the half it can see.
The Coupling Gap makes the assumption explicit. It is a single number: the highest technology gate passed, minus the lowest manufacturing gate passed. Nothing more complicated than a subtraction, which is the point. It fits on one line of an investment memo.
How it is scored
- Scored 1 to 9 on each ladder, so the gap is a number between 0 and 8.
- Graded by source quality. A gate claimed in a deck is not a gate evidenced by a qualification report.
- Signed by a named assessor. Somebody owns the number.
- Registered on a public, append-only record so the score cannot quietly improve between rounds.
What the number tells you
| Gap | What it usually means | What it costs |
|---|---|---|
| 0–1 | The two ladders are moving together | Normal scale-up risk |
| 2–3 | Manufacturing is trailing but tracking | A funded work package, months |
| 4+ | A technology company that has not started industrialising | Years, and usually a second raise nobody modelled |
The size of the gap tells you something specific about timeline and capital requirement that no amount of technology diligence will surface, because technology diligence is measuring the ladder that is already climbing.
Most acquisitions and most capital allocations that fail in advanced manufacturing fail at the same point: the buyer paid for a capability that could not be run at the rate, cost and yield the plan assumed. The Coupling Gap is the one number that would have shown it before the cheque cleared. It is what an operator-grade read produces, and it is why the read exists.
The gap is a measurement, not a verdict. A large one is not a reason to walk; it is a reason to price correctly, sequence the work, and know which constraint binds first. Read alongside Deployment Readiness, which describes the position, and manufacturing capability readiness, which is the second ladder it measures against.
Questions
What is the Coupling Gap?
The Coupling Gap is the distance between the highest technology gate a company has passed and the lowest manufacturing gate it has passed. Both are scored 1 to 9, so the gap is a number between 0 and 8. A company at TRL 7 with a manufacturing capability readiness (MCRL) of 3 carries a Coupling Gap of 4.
How is the Coupling Gap different from TRL?
TRL measures one ladder: how mature the technology is. The Coupling Gap measures the distance between that ladder and the manufacturing one. A high TRL with a large Coupling Gap is the common and expensive case, because the technology reads as nearly finished while the ability to make it repeatedly has barely started.
What does a large Coupling Gap cost?
Time and a second raise. A gap of 2 to 3 is usually a funded work package measured in months. A gap of 4 or more usually means a technology company that has not begun industrialising, which is measured in years and rarely appears in the original plan.
Who should measure the Coupling Gap, and when?
Anyone committing capital to a physical technology, before the commitment. It is measured by people who have industrialised a process rather than by generalist technical advisors, because the lower ladder can only be scored by someone who has climbed it.