What-If and Scope

What-If Flow Time

A shorter flow time lowers WIP when throughput stays fixed.

highlighted = computed this step

Shorter Flow Time

The what-if flow time is 2 hours.

what-if flow time=2\text{what-if flow time} = 2
Shorter flow timeThe table recomputes WIP when flow time is shorter.shorter-flow-time what-ifthroughputflow timeWIPreductionwhat-if1222412

What-If WIP

At the same throughput, WIP becomes 24 jobs.

12×2=2412\times2 = 24
WIP and flow timeThe chart compares base WIP with the shorter-flow-time what-if.Little's Law WIP and flow timethroughput 12 jobs/hour; flow time 3 hours; WIP 36 jobscasethroughputflow timeWIPchangebase12336baselinewhat-if12224reduction 12basebase WIP 3612 x 3what-ifwhat-if WIP 2412 x 2what-if WIP 24; reduction 12deterministic Little's Law arithmetic only

WIP Reduction

The WIP reduction is 12 jobs.

36−24=1236 - 24 = 12
WIP and flow timeThe chart compares base WIP with the shorter-flow-time what-if.Little's Law WIP and flow timethroughput 12 jobs/hour; flow time 3 hours; WIP 36 jobscasethroughputflow timeWIPchangebase12336baselinewhat-if12224reduction 12basebase WIP 3612 x 3what-ifwhat-if WIP 2412 x 2what-if WIP 24; reduction 12deterministic Little's Law arithmetic only