Ask an owner where their bottleneck is and they will point at a machine.
It is a reasonable instinct. The machine is visible, it breaks down, people complain about it, and there is a satisfying feeling in fixing something you can walk up to and touch.
It is also, most of the time, the wrong place to be looking.
The number that surprises people
In my experience, for the large majority of businesses, the constraint is not inside the business at all. It is market demand. Sales.
I would put that above nine in ten across the businesses I have worked with. Not manufacturing capacity. Not the machine. Not even the people. Demand.
This matters because everything you do about a constraint depends on correctly identifying it first. Point at the wrong step and you will run a disciplined, well-executed improvement programme that changes nothing you care about.
What that looks like when you get it right
I took over the heating division at SKOPE. The commercial performance needed lifting, and there was no shortage of things we could have improved internally.
We did not start there. We started at the constraint, which was demand.
That meant re-energising the sales team and getting them back out on the road, physically in front of the shops rather than working the phone from a desk. It meant building genuine demand through campaigns run with head office rather than waiting for the market to come to us. It meant the whole division pointing at one thing: moving more product.
Division sales went up more than 20 percent in 18 months, alongside measurable gains in customer satisfaction.
Nothing in that came from making the factory faster. The factory was not the limit.
Why this gets missed
Three reasons, and I have seen all of them.
A constraint outside the business is uncomfortable. You cannot schedule it, and you cannot fix it with a purchase order. A machine is a problem you know how to have.
Internal improvement produces visible activity. Reports, projects, meetings, measurable local gains. It all looks like progress and none of it lifts throughput when demand is the limit.
The people who would tell you are not in the room. The sales team knows. They are usually the ones saying the market has gone quiet while operations is being asked to cut costs.
What to do about it
The Five Focusing Steps do not care where the constraint is. They work the same whether it is a machine, a policy, or the market.
- Identify it. Ask honestly: if you could sell twice as much tomorrow, could you make and deliver it? If yes, your constraint is demand and it is not on the floor.
- Exploit it. If demand is the constraint, exploiting it means not wasting a single enquiry. Slow quotes, unanswered calls, no follow-up. Free capacity, thrown away.
- Subordinate to it. The rest of the business runs to serve that. Manufacturing takes its pace from what has actually been sold, not from keeping machines busy.
- Elevate it. Now spend. More sales effort, more marketing, a new channel. It comes fourth on purpose, and plenty of businesses spend here on capacity they did not need.
- Go back to step one. If demand lifts far enough, the constraint moves inside, and now the factory conversation is the right one. Do not carry the old rules across.
The uncomfortable version
If demand is your constraint, then cutting costs on the floor is not just ineffective. It can make things worse, because the capacity you cut is the capacity you will need the moment sales improves.
That is a hard conversation to have with a business that is nervous about money. But it is the honest one, and it is usually the difference between a year spent getting efficient and a year spent getting busy.
Work it through
There is a free Five Focusing Steps worksheet on this site. It asks for your answers rather than explaining the theory at you, and you finish with a named constraint and a plan for it.
If you get to step one and the honest answer is that you could comfortably make more than you are selling, you have found it. It is not in the factory.