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Ratio between the expected number of optional activities that are instantiated in a case belonging to a group of cases, and the expected number of activities that occur in a case belonging to 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

$\frac{\sum _{c \in g} \mathit{OptA}(c)}{\sum _{c \in g} \mathit{A}(c)}$

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