Gavin Ritz writes in LO25401:
> To date no best model covers all situations. If I want to solve a certain
> problem that has only a 1 year time horizon I would use the Kepner-Tregoe
> method. If I want to solve a problem at shop floor with a 3 month time
> horizon I will use the 5 Y's. If I have a 2-5 year problem I would use SSM
> or ST.  If I have an accountability or structure problem I would use SST,
> if I want to look at recursiveness and take into account the law of
> requisite variety I would use VSM. If I had a shop floor problem that
> needed a 2 year time horizon I would use TOC. If I wanted to match
> environments to viable systems and utilize tensions I would use EKS. 
This looks to me like the beginnings of something that could be quite
useful to a LO, or even someone in any organization trying to tackle a
particular problem: a taxonomy of organizational problem-solving tools. 
Gavin addresses two dimensions here: time frame and the particular context
of the situation.  I'll try to lay out the above to show it more clearly: 
Time Frame      Situation            Model
----------      ---------            -----
3 month         Shop floor           5 Y's
1 year          ???                  Kepner-Tregoe
2 year          Shop floor           TOC
2-5 year        ???                  SSM, ST
???             accountability,      SST
                structure
???             recursiveness,       VSM
                requisite variety  
???             SY-SU matching,      EKS
                utilize tensions
Gavin, I apologize if I've distorted your intent. 
Would anyone with experience in these or other tools like to add to this,
or perhaps disagree and offer a different taxonomy?  (It would also be
useful to add references to the model names.)  I can imagine this turning
into something that would be worth maintaining on the LO web site. 
Best regards,
[Host's Note: Gavin has pointed me to his web site which includes a
diagram that helped me understand his views. See
   http://sites.netscape.net/gavinritz/info
...Rick]
--Don Dwiggins "All models are false, d.l.dwiggins@computer.org but some are useful" -- George Box, "Statistics for Experiments"
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