Interesting blog article by Prof. Robert Coe on the difficulty in providing valid, reliable and useful feedback from lesson observations.
“The reported reliabilities of observation instruments used in the MET study range from 0.24 to 0.68.
One way to understand these values is to estimate the percentage of judgements that would agree if two raters watch the same lesson. Using Ofsted’s categories, if a lesson is judged ‘Outstanding’ by one observer, the probability that a second observer would give a different judgement is between 51% and 78%.”
So, should we move towards purely formative feedback from teacher observations? There are a range of interesting suggestions about how this might be done on Joe Kirby’s blog.