Decrease the variability of the stations

Technically, this corresponds to reducing the congestion coefficient, but practically it means doing anything that causes the stations to run in regular clocklike fashion (i.e., not in fits and starts).   Though variability reduction can  be applied to all the stations in the line, it is usually more effective when applied to the bottleneck station or some other highly utilized station. However, decreasing variability in non-bottleneck stations can be very useful in stations that starve the bottleneck. The following strategies exist for reducing variability:

• Reducing MTTR
• Reducing MTTF
• Reducing setups
• Improving yields
• Reducing rework
• Training operator
• Making material readily available.
• Using parallel machines in place of single machines (because they are less vulnerable to disruptions that cause variability).

Performance increase with decrease in variability

 Note:

• The benefits of the capacity increase can be realized via increased throughput, decreased cycle time, or a combination of both.
• By Little's Law, increasing TH for constant WIP, or reducing WIP for constant TH means that cycle time will also be reduced.