The assembly operator has completed the assigned task on the current work unit, but the next unit has not yet arrived at the station.

The products are identical or similar.

The operator has completed the assigned task on the current work unit but cannot pass the unit to the downstream station because that worker is not yet ready to receive it$.$

The time interval between arrivals of work units at a station.

The actual amount of time available at the station to perform the assigned task.

The proportion uptime on the production line.

A small amount of work that has a specific limited objective, such as adding a component to the base part or joining two components

Restrictions on the order in which the worl elements can be performed.

Cannot be subdivided any further without loss of practicality