PPI Repository

Rework Cost

\mathit{RC}\mathit{^{\times}}(c)

\mathit{\times} \in \{\mathit{sgl}, \mathit{sum}\}

Dimension:

Cost

Granularity:

Case

Description

Total cost of all times that any activity is instantiated again, after its first instantiation, in a case.

Potential use

Event log that contains cost information where measuring rework is of relevance.

Assumptions

Minimizing the cost of rework is desirable.

Desired Value:

MINIMIZE

Required attributes

act
actinst
case
tc
type

Equations

Formula for practitioners

$\mathit{TC}(c) - \sum _{a \in A} \mathit{fitc}(c, a)$

$\mathit{TC}(c)$ returns the total cost of case $c$ .
$\mathit{fitc}$ returns the cost of the first instance of activity $a$ in case $c$ .

Formal Definition

$\mathit{TC}(c) - \sum _{a \in A} \mathit{fitc}\mathit{^{\times}}(c, a)$
The $\mathit{\times}$ indicates that the PPI can take multiple forms, in this case, $\mathit{\times} \in \{\mathit{sgl}, \mathit{sum}\}$ . If $\mathit{\times} = \mathit{sgl}$ , then the function considers single events of activity instances for cost calculations, i.e., it uses $\mathit{fitc}\mathit{^{sgl}}$ ; if $\mathit{\times} = \mathit{sum}$ , then the function considers the sum of all events of activity instances for cost calculations, i.e., it uses $\mathit{fitc}\mathit{^{sum}}$ .

Python implementation

This indicator is implemented in the process_performance_indicators Python library.

process_performance_indicators.indicators.cost.cases.rework_cost

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