This question tests accountability and learning, not perfection. Admit it plainly, explain what you did to limit the damage, and show what changed afterward.
How to approach it
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1. Own it — no excuses, no blaming others
2. Explain the cause honestly (often: underestimation or hidden complexity)
3. Describe how you communicated early and contained the impact
4. End with the concrete habit you changed
The communication piece is critical: a missed deadline you flagged early is very different from a surprise.
Worked example
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S: I committed to a reporting feature in one sprint.
T: Midway I realized the data source was messier than expected.
A: As soon as I saw the slip, I told my lead, gave a revised estimate, and
shipped a smaller working version first.
R: We delivered the full feature a few days late but with no surprises. Now I
add a buffer for any task that touches unfamiliar data.
