Scrum Burndown Chart - International Scrum Institute

The Scrum Burndown Chart is a visual measurement tool that shows the completed work per day against the projected rate of completion for the current project release. Its purpose is to enable that the project is on the track to deliver the expected solution within the desired schedule.

Simple Burndown Chart

The rate of progress of a Scrum Team is called "velocity". It expresses the amount of e.g. story points completed per iteration. An import rule for calculating the velocity is that only stories that are completed at the end of the iteration are counted. Counting partially finished work (e.g. coding only - test missing) is strictly forbidden.

After a few Sprints the velocity of a Scrum Team will most likely be predictable and would allow quite accurate estimation about the time needed until all entries in the Scrum Product Backlog will be completed. If the velocity of a Scrum Team is e.g. 30 story points and the total amount of remaining work is 155, we can predict that we need about 6 Sprint to complete all stories in the Backlog.

However in reality the entries in the Scrum Product Backlog will change over the duration of the project. New stories are added and other stories are changed or even deleted. In the simple Burndown Chart the velocity of the Scrum Team and the change in the scope cannot be distinguished. To reflect this, another form of diagram can be used.

Separating Velocity and Scope Changes

Here a bar chart instead of a line diagram is used. The size of each bar represents the total amount of work remaining at the start of each sprint. The velocity of the team is subtracted from the top while changes in the Scope change the bottom of the bar.

To get even more accurate we can also take the rate of changes in total work into account. However we have to be careful when using this model since the rate of change will be high in the beginning of the project but will drop at the end.

Extended Burndown Chart with Prediction

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