How do you measure 'contribution'?

In the past few weeks, I've been working fast and furious at getting web2project to our v1.0 milestone.  As part of that effort, I track open issues, problematic modules, community feedback via the forums, death threats via all methods, and other related aspects.  And somewhere along the way, it led me to ask a seemingly simple question:

How do you measure an individual's contribution?

So you answer:

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