Sprint progress and bottleneck signals day by day.
The vertical axis is story points remaining. The horizontal axis is days across the sprint. The dashed gray line is the ideal burn — a straight diagonal from total points to zero. The blue line is actual remaining work. The amber dashed line is the forecast. Red dots signal danger points. Switch between four scenarios to see the patterns every Agile PM must recognise: healthy flow, flat start, scope added mid-sprint and late heroics.
A flat burn-down in the first two days feels harmless — the team is still getting started. By day three it is a structural crisis. With seven days left and forty points untouched, the team needs to burn at double the planned pace. The time to intervene is day one, not day seven. The burn-down is only useful if you read it daily and act on what it tells you.