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Cumulative Flow Diagram is a visual representation used in Kanban to help analyze the stability of the workflow. The CFD is the overall best practice to track progress and estimate process health, fast and effortlessly. 

A Cumulative Flow Layout: 

The diagram shows data in an area graph, displaying the total volume of work for any of the process stages. If you have 4 stages: to do, in progress, in review, and done, then your CFD will have four areas.

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The Cumulative Flow Diagram (CFD) chart is designed to find typical information about the status of work: how much work is done, ongoing and in backlog, what is the pace of progress. On the other hand, once you understand the chart, it will help you to spot all sorts of issues that a team may be facing and it creates is real value. 

Understanding  the Diagram: (Below) 

First, the meaning of the lines. The green one shows how many items have been delivered over time. Everything that is between the blue and the green curves is stuff that is in testing. The area between the red and the blue lines shows how much stuff is in development (either ongoing or done). Finally, the top part below the orange line is the backlog – how many items weren’t yet started.

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