PPI Repository

Percentage of times that an activity is instantiated again, after its first instantiation, in any case of the event log.

If the event log does not contain cost information, Rework Percentage can be used as a proxy for the cost performance of an activity.

Minimizing rework is desirable.

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Formula for practitioners

$\frac{\mathit{RewC}(a)}{\mathit{I}(a)}$

$\mathit{RewC}(a)$ returns the rework count for activity $a$.
$\mathit{I}(a)$ returns the number of instances of activity $a$.