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What is a good rule-of-thumb for the maximum number of metrics on an individual scorecard?  It is clear from the many balanced scorecard presentations that I've seen that organizations quickly recognize that they have too many to manage.  They often start with more than a 100 metrics and over a few years winnow the list down to 10 to 20 survivors.  But is that the "right number" to avoid metrics overload?  I'm unaware of any definitive studies on this specific question.  My instincts tell me that that's still too high and that five to seven is the correct answer.  Let me try to support those instincts.

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