How to answer “Tell me about a mistake you made”
Reviewed 19 Sept 2026
The interviewer is not looking for someone who has never made a mistake. They want to know whether you notice your errors, take responsibility, and change how you work afterwards. A fake mistake (“I work too hard”) fails on all three.
Choose a real mistake that was yours, that had a consequence, and that is not central to the job you are applying for. Then spend most of the answer on what you did about it.
The structure: mistake, consequence, repair, change
- Mistake
What you did or failed to do, stated plainly in one sentence that begins with “I”.
- Consequence
What it caused. Be honest, and do not dramatise it.
- Repair
What you did once you realised, including telling the people affected.
- Change
The specific habit or check you use now because of it. This is the part they will remember.
Before and after
“To be honest I can't think of a big mistake. Maybe sometimes I'm too much of a perfectionist and I take on too much because I care about quality, so I've learned to delegate more.”
- The interviewer has heard this exact answer many times and recognises it as avoidance.
- No event is described, so there is nothing to discuss.
- “Learned to delegate more” is a claim with no evidence.
“In my first year as a coordinator, I sent a supplier the wrong version of a specification, because I assumed the latest file in the shared folder was the approved one. They produced two hundred units to the old design. I found out when the samples arrived. I told my manager the same day, called the supplier, and we agreed to split the cost of the rework, which came to about two thousand euros. Since then I never send a document without checking its approval status, and I added an “approved” label to our folder structure that the whole team now uses. Nothing like it has happened again in three years.”
Phrases you can use
- “I made a mistake with…”
- “I assumed… without checking.”
- “That was my responsibility, and I got it wrong.”
- “As a result,…”
- “It cost us about…”
- “The client received… a week late.”
- “As soon as I noticed, I told…”
- “I called the supplier the same day.”
- “We agreed to…”
- “Since then, I always…”
- “I introduced a simple check:…”
- “It hasn't happened again.”
Common mistakes
Use a real event. A modest, real mistake is far stronger than a disguised strength.
Even if others contributed, describe your part. “I assumed” is a good honest verb.
Tell it calmly, in the past tense. You are showing that you can discuss errors without panic.
Do not choose an error in the core skill of the job, or anything involving dishonesty.
A ten-minute drill
- Choose a real mistake from at least a year ago.
- Record a 60-second answer. The first sentence must start with “I” and name the mistake.
- Check the transcript: is the repair-and-change part longer than the mistake part? It should be.
- Record again with a steady, unhurried pace.
Questions people ask
How serious should the mistake be?
Serious enough to have had a real consequence, such as lost time, some cost, or an unhappy client, and small enough that it was fixed. It should also be old enough that you can show a lasting change.
What if they ask for a second example?
Have one ready from a different area, for example a communication mistake if the first was a process mistake. It shows the first was not rehearsed as your only story.
Should I apologise for it in the interview?
No. The interviewer was not affected. State it factually, show the repair, and move to what changed.