What we look for

Every business has one binding constraint.

It falls into one of eight categories. Most owners can name the constraint they think is binding — usually it isn't the one that actually is. The difference matters, because targeting the wrong category produces a fix that doesn't move the system.

The 8 categories

Where the constraint usually lives

In any operating business, the binding constraint at a given moment is in one of these. The diagnostic checks each.

Equipment / Production Capacity

A physical resource is at 100% utilization during your revenue-weighted peak. The bottleneck is something you could in principle buy more of, if buying more were the right move.

Signs you might have this

A specific machine or workstation has a queue forming during peak hours
You routinely tell customers "we can't take any more orders this week"
Your team works around the limitation rather than naming it

Examples

A bakery's deck oven. A manufacturer's CNC machine. An agency's review pipeline. A clinic's exam rooms. A restaurant's grill station.

Skilled Labor Hours

A specific role has limited capacity. The constraint isn't equipment or space — it's how many hours a particular kind of person can put in.

Signs you might have this

When one person is out, certain work simply stops
Overtime is concentrated in a single role
There's a waitlist for one person's time, not the team's

Examples

Head baker. Lead decorator. Senior partner at a law or accounting firm. Master engineer. Lead nurse practitioner.

Skill Concentration

Only one trained person knows how to perform a critical operation. Goldratt's "bus factor of one." The business runs on hidden dependencies that nobody has written down.

Signs you might have this

The owner says some version of "only Dave knows how to do that"
There's real panic at the idea of a specific person quitting
Cross-training has been talked about for years and never happened

Examples

The only employee who can run the legacy ordering system. The founder's personal Rolodex of customer relationships. The one technician who knows how to recalibrate the equipment.

Space

Physical space is what's limiting throughput. Square footage, display case linear feet, cold storage volume, parking spots — geometry as the binding limit.

Signs you might have this

Inventory is being stored in hallways or off-site
Customers wait outside, in cars, or leave before being served
Production stages are blocked because the next stage has no room to receive

Examples

Retail floor or display case. Production floor. Cold storage. Parking. Loading dock. Conference room availability for a service business.

Demand / Market

The actual constraint is that there aren't enough customers. Much less common than owners think — usually under a third of cases — but real when it's real.

Signs you might have this

Resources sit idle even during what should be your peak
Pricing power has eroded — discounting is constant
Sales are flat or declining despite operational improvements

Examples

A consumer product in a shrinking category. A specialist whose niche is too narrow for the geography. A service business in a depopulating market.

Time / Scheduling

Operating hours, lead times, production windows, or supplier cadence — the constraint is when things can happen, not whether they can.

Signs you might have this

You can't take orders past a certain time of day
Suppliers deliver on a rhythm that doesn't match your demand
Lead times are losing you customers who won't wait

Examples

A bakery whose oven schedule has to start at 3am. A manufacturer who can't get parts faster than 6 weeks. A dental practice that can't see patients on weekends.

Cash / Working Capital

The operation could run at higher capacity, but you can't fund the inventory, labor, or equipment needed to get there. The bottleneck is on the balance sheet, not the floor.

Signs you might have this

Stockouts you could prevent if you had cash to pre-buy
Demand is there, but you can't hire the next person
Vendor payment terms are dictating operating decisions

Examples

A growing service business that's hire-constrained. A retailer that can't stock for seasonal peaks. A manufacturer with long accounts-receivable cycles.

Policy

An unquestioned rule, habit, or assumption is the real constraint. Goldratt's central insight: the physical limit is almost always a symptom of a policy. The fix targets the policy — because changing equipment without changing the policy reproduces the same bottleneck at higher capacity.

Signs you might have this

A rule that made sense in 2018 still governs decisions in 2026
Nobody can explain why "we do it this way"
The pattern shows up across multiple parts of the business

Examples

Pricing rules that no longer fit market reality. Production sequencing habits. Capacity planning assumptions. Hiring or scheduling policies that anchor on old constraints.

Why only one

The math of bottlenecks

Imagine a kitchen that can produce 100 meals per hour. The dishwasher can clean 60 plates per hour. The system's throughput is 60 — capped by the slower stage. Upgrade the kitchen to 120 meals per hour and throughput stays at 60. The kitchen improvement bought you nothing.

Now upgrade the dishwasher to 120 plates per hour. Throughput jumps to 100 — and the kitchen is now the binding constraint. The bottleneck moved.

That isn't a methodology preference. It's arithmetic. The throughput of any pipeline equals the throughput of its slowest stage, always. Improvements to non-slowest stages produce zero throughput change. This is why the diagnostic spends most of its time figuring out which stage is actually slowest — and why fixing the wrong thing is the most expensive mistake an operator can make.

A note on policy

The physical limit is usually a symptom.

When the diagnostic surfaces a constraint that looks like equipment or labor, the next question is always: why is that the constraint? Almost always, the answer traces back to a policy — a pricing rule, a scheduling habit, a hiring assumption — that was set years ago against a different operating reality. The fix targets the policy. Replacing the equipment without changing the policy just reproduces the same bottleneck at higher capacity.

Want to know which one you have?

A Throughput Diagnostic is a two-week, fixed-fee engagement that names your binding constraint, identifies the policy underneath it, and quantifies the annual leak. The deliverable is a six-to-ten page report — yours to keep, with no obligation to continue.

Book a call