Definition
The unit is loaded forward, waiting for all to be put on the last operator, making waste a pointable amount.
In detail
The Least Operator Concept is a method of cell design that, by loading work forward, concentrates waiting time on the last operator, making Muda visible. It addresses how to determine the minimum number of people required for a cell and exposes the Bottleneck. Unlike conventional staffing, it does not create new waiting; it concentrates the waiting that already exists onto the last operator, while the others are loaded to Takt Time, so that Kaizen can be continuously focused on the last operation. The outputs are a clear operator configuration and waiting area.
Example in practice
When designing a U-shaped cell, first simulate using the Least Operator Concept: let the first operator work at full capacity, subsequent operators take over in sequence, and the last operator experiences waiting. This waiting point is the Kaizen target: continuously improve the remaining work of the last operator until this position can be withdrawn and the remaining people share the load at full capacity (see least-man entry), rather than spreading the waiting evenly across everyone—even distribution equals returning to the "traditional" load distribution that the card judges as incorrect.