A control chart shows the cycle time for your product, version or sprint. The horizontal x-axis in a control chart indicates time, and the vertical y-axis indicates cards (issues).A control chart helps you identify whether data from the current sprint can be used to determine future performance. The less variance in the cycle time of an issue, the higher the confidence in using the mean as an indication of future performance.
To view the control chart:
- Access the Rapid Board using the top navigation bar, then select your Rapid View from the 'Rapid View dropdown' (see Using the Rapid Board).
- Click the Report tab, then select Control Chartfrom the drop-down at left. The control chart for your current sprint will be displayed (see screenshot below).
- To re-draw the chart excluding a column(s) or swimlane(s), or to apply a quick filter, click Refine (see below).
- To select a different timeframe (past week/past month/past 3 months/past 6 months/all time/custom), click the date range at the top of the chart.
Screenshot: Control Chart
Refining the Control Chart
You can refine your displayed control chart by clicking Refine at the top right of the chart.
The control chart includes all issues that spent time in any of the selected columns and are no longer in any of the selected columns. Therefore, selecting the To Do and In Progress columns will normally show you the cumulative time from issue creation to completion (as you will only see issues that spent time in these columns and are not located there anymore — that is, you will see all issues that are currently Done).
If you select only the In Progress column you will see the time an issue has spent in development. That is, you will only see issues that passed through In Progress but are now either located in To Do or Done. Issues that moved directly from To Do to Done won't show up; neither will issues that are still In Progress.
If you only select the last column (typically called 'Done'), you will only see issues that moved in and out of the Done column — which in most cases is not very useful. Your completed issues won't show up, as they are still located in the Done column. Selecting the last column will therefore often not make much sense, unless perhaps your rapid board maps to only part of your workflow.
Each issue is displayed at the last time it moved out of any of the selected columns, as the control chart only shows a single data point for each issue. The date range selector simply filters out issues that don't match that date.
Even though an issue might have been updated during a selected time range, it won't show up in the control chart unless it has been "completed" during that time.
So, for example, if you have an issue that moved on day 1 from To Do to In Progress, then on day 2 from In Progress to To Do, then on day 3 from To Do to In Progress and then on day 4 from In Progress to Done, and you select the To Do and In Progress columns on your control chart, the issue will show up as a dot on day 4, and on day 4 only.
If you now choose a date range that only covers day 2 and day 3, the example issue won't show up even though it moved through your selected columns during that time.