For example, a machine breakdown, rest break to overcome fatigue, and receiving instruction from the manager are the interruption related to work, but personal needs, lunch breaks, and personal telephone calls are interruptions not related to work.
However, the two types of interruption are both essential for the worker because it is almost impossible to work continually during a regular shift.
However, it is categorized as 5%, but it also depends on the work environment, e.g. in terms of discomfort and temperature.
They usually refer to work-related events like cleaning up at the end of the shift, and machine breakdowns or malfunctions.
Unavoidable delays occur because of many random events at work stations.