Re: SIP is not Takt Time

--- In [email protected], Dossy <dossy@p...> wrote:

> 
> I wonder if Kent had this in mind, as well.  I'm surprised he 
> hasn't chimed in yet.
> 

I have some rather unrelated comments:

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.  Reinertsen recommends measuring inventory.

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.

3. I'm going to guess that the issue is going to be - when do 
features come under one's span of influence?  I argue that one's 
span of influence is one level higher than one's span of control.  
That is to say, if you can *control* how fast features get 
developed, then you can and should *influence* how fast features 
move from being customer needs into implemented features.  SIP 
should measure at the level of your span of influence, rather than 
at the level your span of control.  This creates a climate for 
collaboration.  

Mary


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