Re: SIP is not Takt Time

Hi Mary,

> 1. Inventory - ie. amount of stuff in queue - is not the same thing 
> as duration - ie. average time in queue.  However, they are directly 
> proportional based on Little's Law, so when you measure one, you 
> measure the other.

... as long as throughput is constant.

> 2. As commonly used, *lead time* has referred to the amount of time 
> it takes to bring something from outside under one's span of 
> influence, while *service time* is the (average) time it takes to 
> move something through one's span of influence to completion.

The form of Little's Law I learned had a quantity called response
time, which, in a system with a queue, is time-in-queue plus
time-in-service.

Dale



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