PPI Repository

Elapsed time between the start event of an activity instance and the complete event of the activity instance that precedes it.

Event log in which the time spent between every activity instance is of relevance.

Minimizing waiting time is desirable.

actinst
case
time
type

Formula for practitioners

$\begin{cases} \mathit{stime}(i) - \mathit{ctime}(x) & \mathit{for~any \ } x \in \mathit{prev}(i) \\ 0 & \mathit{if \ } \mathit{prev}(i) = \emptyset \end{cases}$

$\mathit{stime}(i)$ returns the start timestamp of activity instance $i$.
$\mathit{ctime}(x)$ returns the completion timestamp of activity instance $x$.
$\mathit{prev}(i)$ returns the set of preceding activity instances to instance $i$.