How to give feedback to an underperforming teacher, fairly
Complaints about a colleague rarely arrive as clear evidence. Here is how to give feedback to an underperforming teacher in a way that is fair, proportionate and actually helps them improve.
By Jacques Tredoux, founder of Northbeam Leadership · 23 October 2026 · 5 min read
It rarely starts with a formal concern. A colleague mentions something in the staffroom. Two students say they cannot follow the lessons. A parent sends an email. Before long you have a picture of a teacher who is struggling, and a strong urge to do something about it quickly. If you are wondering how to give feedback to an underperforming teacher, the first thing I would say is this: slow down before you speak.
Not because the concerns do not matter. They do. But a conversation built on hearsay is very hard to get right, and a conversation that feels unfair can damage trust for years.
Separate evidence from interpretation
Most concerns arrive as a mixture of three things. Some are observable evidence: "the homework instructions were not on the board". Some are interpretation: "her lessons are chaotic". And some are unsupported judgement: "she is just not cut out for it".
Before you act, sort what you have heard into those three groups. You will often find that the evidence pile is much smaller than the overall impression suggested. That is not a reason to dismiss the concern. It is a reason to find out more.
Gather proportionate evidence yourself
A single parent email does not justify a formal process. Equally, repeated concerns from different sources should not be waved away. The fair response sits in between.
Talk to the teacher first. Let them know, privately and calmly, that some concerns have been raised and that you would like to understand what is happening. Many teachers already know a class is not going well and are relieved to be asked.
See it for yourself. Arrange a short, agreed visit to the lesson rather than relying on accounts from others. Write down what you see and hear, not what you think it means.
Look at more than one source. Students' books, planning and a second visit to a different class will tell you whether this is a pattern or a difficult week.
How to give feedback to an underperforming teacher: use FAIR
At Northbeam we use a simple structure called the FAIR Feedback Framework. It keeps the conversation grounded and stops it turning into a list of complaints.
F: Facts from the evidence. Start with what was actually seen and heard, without labels. "In the first ten minutes, six students asked what they should be doing" is far easier to discuss than "your lessons lack clarity".
A: Ask reflective questions. Let the teacher analyse the lesson before you do. "How did you feel the start of the lesson went?" often brings out the very point you were going to make, and it lands better when they find it.
I: Identify one focus. Resist the temptation to fix everything at once. Agree a single, specific priority, such as clear instructions at the start of every lesson, that will make the biggest difference.
R: Review through follow up. Decide together how and when progress will be checked. Then do it. Feedback with no follow up tells the teacher it did not really matter.
Remember who is in the room
Over more than twenty years in education, I have seen the same pattern many times. Teachers who are struggling usually know it. What they fear is being judged before anyone has looked properly. When a leader shows they have taken the trouble to see the evidence, listen and agree one clear step, the conversation changes from a threat into support.
If you would like to see this in action, our animated film The Teacher Everyone Complained About follows a head of department through exactly this situation, from the first complaint to the feedback conversation. Watch the free preview, or get the full film with its facilitator pack on Thinkific.
So here is a question to take into your next week. Is there a view you have formed about a colleague's teaching before you have seen it for yourself?
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