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  • John Alton thinks this is interesting:

cost of delay divided by duration (or “CD3”). It is calculated as cost of delay for a feature divided by the amount of time we estimate it will take to develop and deliver that feature. This takes into account the fact that we have limited people and resources available to complete work, and that if a particular feature takes a long time to develop it will “push out” other features.

From

Cover of Lean Enterprise

Note

Cost of Delay Divided by Duration ("CD3")