You may get some insights from a paper I wrote a few years ago for
Rogers Corp.

http://www.rogers-corp.com/cmu/techtip3.htm

Andy Magee - Flex Guru
Senior Consultant, Bourton Group
[log in to unmask]
(937) 435-3629

ps. As you may notice I'm no longer an independent consultant. The
Bourton Group (formerly Ingersoll Engineers) specializes in the design
and implementation of strategic manufacturing initiatives. We typically
work 'hands on' at all levels from the boardroom to the factory floor
and produce 'real world' (not just textbook) solutions.

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