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Global optimization vs. Local optimization

Donがつぶやいた全体最適vs.部分最適の話題について、Alanが反応していたので自分用のメモとして保存。 併せてその後のDonと何人かのやりとりも収録。
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Donald Reinertsen @DReinertsen
Global optimization vs. Local optimization. Compare the promise and reality of centrally planned economies vs. markets. 1/3
Donald Reinertsen @DReinertsen
Global optimization can be exponentially more difficult and is more perishable, only briefly valid 2/3
Donald Reinertsen @DReinertsen
Local optimization should be in the toolkit of any lean thinker. It can be closer to the true spirit of lean than system thinking. 3/3
Al Shalloway @alshalloway
@DReinertsen power of flow is you can do local optimizations w/ confidence you are helping the whole
Al Shalloway @alshalloway
@DReinertsen w/o understanding principles local optimizations can have adverse affect on entire Value stream
Al Shalloway @alshalloway
@DReinertsen hopefully clear i'm in strong agreement
Akbar Zamir @akbarzamir
@DReinertsen What about insights from Op Research, the beer game and such? Local optimisation in that supply chain seems problematic.
Akbar Zamir @akbarzamir
@DReinertsen Or is it rather a question of *which* local property we choose to optimise?
Donald Reinertsen @DReinertsen
@akbarzamir I am in favor of having both tools available and fitting to context. Beer game is simple but illustrates time lags well.
Alina Hsu @alinahsu
@DReinertsen IME global optimization is more a matter of using balanced whole-system metrics than of central planning.
Donald Reinertsen @DReinertsen
@akbarzamir IMO it is smart, but not really global optimization, when you start dropping parameters from your target performance function.
Akbar Zamir @akbarzamir
@DReinertsen I guess I'd expect a greater lag in feedback when monitoring system rather than local parameter.
Niklas Björnerstedt @smalltalk80
.@DReinertsen Global optimization by top down management is not Systems thinking.
Donald Reinertsen @DReinertsen
@alinahsu In world where local optimization is unfashionable we could call choosing a subset of metrics to optimize "global optimization".
Donald Reinertsen @DReinertsen
@smalltalk80 It is probably not really optimized if top down. I see global optimization as state variable, ie path-independent.
Donald Reinertsen @DReinertsen
@akbarzamir A good example of this is how local WIP control loop of kanban can be 100x faster than the more global WIP constraint of TOC.
Niklas Björnerstedt @smalltalk80
.@DReinertsen The point is that systems thinking is about more than a systems optimum. It is also about the right way of achieving it.
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