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Ratio between the number of optional activities that are instantiated in a group of cases, and the number of activities that occur in a group of cases. \newline An activity is considered optional if there is at least one case in the event log where it does not occur.

Process with multiple activities that are not instantiated in every case.

A greater number of optional activities is desired, as it implies a greater capability to address unexpected situations.

act
case

Formula for practitioners

$\frac{\mathit{OptA}(g)}{\mathit{A}(g)}$

$\mathit{OptA}(g)$ returns the optional activity count for group $g$.
$\mathit{A}(g)$ returns the number of unique activities in group $g$.