An efficient line balancing will minimize the amount of idle time.
The balance efficiency can be calculated as
∑t/ CT * N
∑t = sum of the actual worker times or task times to complete one unit.
Ct = cycle time
N= No of workers or work stations
The grouping of tasks is done with the aid of a precedence diagram. The precedence diagram is divided into work zones or stations and the appropriate activities are grouped under each workstation, until the cycle time is as fully utilized as possible.