Visual Analytics A/R Matrix

Screenshot of PMTk – the Process Mining Toolkit

Screenshot shows the Activities-Resource Matrix visualizing how frequently each resource performed each activity in the process. The darker the cell color, the higher the number of recorded occurrences for that activity-resource combination.

The Activity-Resource Matrix provides a cross-tabular heatmap that maps activities (rows) against resources (columns), making it easy to understand how work is distributed across your team or system. Each cell represents the relationship between a specific activity and a specific resource, colored by intensity to reflect either how frequently that resource performed the activity, or how well they performed it in terms of time. Empty (uncolored) cells indicate that a given resource was not involved in that activity within the filtered event log.
This view is particularly useful for identifying specialization patterns, workload imbalances, or performance bottlenecks at the activity-resource level.

A/R Matrix Configuration

The legend panel and configuration panel provide the following settings.

Setting	Description	Values
Color Scale Variant	Controls how metric values are mapped to colors.	Linear (default) Distributed continuous and proportional across the full value range. Binned Grouped into discrete buckets, each assigned a uniform color.
Show Statistics	Toggles the display of statistical information within the matrix cells.	Disabled (default) Enabled
Relative Values	Toggles the use of relative values compared to the total occurrence in each row.	Disabled (default) Enabled
Decoration	Controls what the cell values represent.	Frequency (default) Cells are colored by how often a resource performed a given activity. Performance Cells are colored by a time-based performance metric for each activity-resource combination.
Performance Metric	Determines how the time values are aggregated per cell. Requires Decoration: Performance.	Average (default) The mean duration across all occurrences. Standard Deviation How much the durations typically deviate from the average.
Considered Time	Specifies which portion of time is measured. Requires Decoration: Performance.	Wait Time Time elapsed before the resource starts working on the activity. Work Time Time spent by the resource actively working on the activity. Wait + Work Time (default) The total elapsed time from the activity becoming available to its completion.

A/R Matrix Filtering

The image shows the filter mode selection in the activity-resource matrix.

Clicking on any cell in the matrix opens a context menu that allows you to apply an Activity-Resource Filter scoped to that specific activity-resource combination. The following filter modes are available:

Option	Effect
Cases
Positive: Keep Cases with Selection	Retains only cases that include at least one event where the selected resource performed the selected activity.
Negative: Remove Cases with Selection	Retains only cases that do not contain any event where the selected resource performed the selected activity.
Events
Positive: Keep Matching Events	Keeps only the individual events matching the activity-resource combination, removing all other events from the log.
Negative: Remove Matching Events	Removes all individual events matching the activity-resource combination, leaving the rest of the log intact.

The filter is applied globally, restricting all downstream analyses and views. It is consistent with the Activity-Resource Filter applied elsewhere in PMTk and can be cleared or adjusted at any time through the filter controls in the top bar.