A burn chart shows us the relationship between time and scope. Time is on the horizontal X-axis and scope is on the vertical Y-axis. A burn up chart shows us how much scope the team has got done over a period of time. Each time something new is completed the line on the chart moves up. A burn down chart shows us what is left to do. In general, we expect the work remaining to go down over time as the team gets things done. Sometimes the work remaining changes suddenly, when scope is added or removed. These events appear as vertical lines on the burn down chart: a vertical line up when we add
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