The Cumulative Flow diagram (CFD) provides a graphic depiction of how cards are moving through various value streams or phases on the way to being ‘Done’. It shows the volume of work-in-progress at each stage in the system.
The CFD analytics is represented in 2 diagrams:
Mouse over the larger diagram (2) and place your pointer on a vertical grid line (4) to see the information (5) like column-wise count of WIP cards and the average aging of those cards on that particular column at a particular moment in the timeline plotted on X-axis.
For example, in the above image, selecting 17 Oct from the date range between 1 Oct - 26 Oct shows the bulk of cards belong to Ready#Ganesha column, whereas Development#Design column has cards having maximum average aging.
Based on the overall pattern, you can sense the pace of the progress, such as whether the flow is constantly growing parallel, or there is an unusual thickening of the band which requires further investigation to detect and resolve any bottlenecks in the workflow.
CFD indicates how much work is done, ongoing and in backlog and what is the pace of progress.The bottom-most column progressively increasing indicates a smooth flow of cards getting done on board and team needs to ensure the flow is maintained.Whereas sharp spikes in bottom-most column line indicate flows of cards are not smooth and constraints need to be identified.
For example, higher average aging of fewer cards at the Validation stage may attribute to longer time being spent on validating cards, which the product owner can introspect and find out the reason for the duration