How to find your bottleneck
Every process has one step that limits the whole. Improving any other step produces nothing but a bigger queue.
A process runs at the speed of its slowest step. That step is the bottleneck, and it is the only place where improvement increases output.
Step-by-step
- List each step in the process.
- Enter its capacity — units per hour or per day.
- Read which step constrains the whole, and what total throughput is.
Only the bottleneck matters
If step three handles 40 units an hour and everything else handles 100, the process produces 40. Doubling step two's capacity to 200 changes the output by nothing at all — it simply builds inventory in front of step three faster.
An hour lost at the bottleneck is an hour lost by the whole business. An hour lost anywhere else costs nothing, because that step has slack.
How to find it without a spreadsheet
Look for where work piles up. Physical queues, growing inboxes, jobs waiting for one person's approval — the bottleneck is almost always immediately upstream of the largest pile.
The other reliable sign is the step everyone complains about waiting for.
What to do with it
- Protect it. Never let the bottleneck sit idle waiting for input.
- Remove work it should not be doing. Anything a non-bottleneck step can do, it should.
- Improve its quality upstream, so it never spends time on work that will be scrapped later.
- Then, and only then, add capacity to it.
The bottleneck moves
Fix one and another appears elsewhere. This is not failure; it is the process working. Re-measure after every significant change, because acting on last quarter's bottleneck is a common and expensive mistake.
Frequently asked questions
How do I identify the bottleneck?
Look for where work accumulates — a physical queue, a growing backlog, or the step everyone waits on. It sits immediately after the largest pile.
Should I improve every step?
No. Only the bottleneck increases output. Improving other steps produces inventory in front of the constraint and no additional throughput.
What happens after I fix it?
The constraint moves elsewhere. Re-measure after each change; acting on a bottleneck that has already moved is a common waste of effort.
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