Glossary · Bottleneck
What is a bottleneck in a process?
Definition: A bottleneck is the step in a process with less capacity than the demand placed on it, which limits the pace of the whole process and creates a backlog.
Every process moves at the pace of its slowest step. If a stage can handle forty cases a day and receives sixty, the remaining twenty pile up in front of it, however fast the steps before and after it may be. That queue is the most visible sign: full inboxes, requests waiting for a signature or orders stuck with one person.
In a business, bottlenecks typically appear in approvals concentrated in one manager, high-volume manual checks, knowledge held by a single person, or systems that do not talk to each other and force staff to copy data. Finding them requires measuring incoming volume, time per step and waiting time. Without that data, people tend to improve the most visible step rather than the one that sets the limit.
The theory of constraints sums it up in one idea: improving any step other than the bottleneck does not increase overall capacity. That is why it makes sense to act on it first, whether by rebalancing the workload, removing unnecessary checks or automating the task. Once it is resolved, the constraint moves to another step, which becomes the next candidate for improvement.
Example: every quote above a certain value waits for the sales director's signature; delegating mid-value quotes to team leaders shortens the queue without losing control.