The Cumulative Flow Diagram (CFD) provides typical information about status of your Scrum project: how much work is done, ongoing and in backlog, what is the pace of progress, etc. In this blog post, Pawel Brodzinski explains that you can also use the Cumulative Flow Diagram to detect the issues that a Scrum team might face.
The Cumulative Flow Diagram allows to detect the changes of scope and the work in progress. The blog post explores several typical cases of Cumulative Flow Diagram and explains what might be the problem that cause the lines in the diagram differ from a “normal” case. This post provides many varieties of Cumulative Flow Diagram and gives for each of them some hints on how they could help you diagnostic issues with your project.
Read the complete post on http://brodzinski.com/2013/07/cumulative-flow-diagram.html