The Ofsted criteria are publically available and a click away, so you could have checked before you posted. It would have taken you five minutes.
I’ve been using those for years but. But that doesn’t really answer the point
We received training from an OFSTED inspector on how to grade lessons. It was the obvious thing. We watched a video of a lesson applied the criteria and discussed our grades.
I asked the OFTED inspector how she was trained and how often they went through a Standardisation process to ensure that the grading was consistent. Standardisation is a compulsory part of any teacher involved in grading a students work for an external exam.
You will of course not be surprised that the answer is that she had never been trained to grade a lesson and had never done any standardisation.
The OFSTED do use a sort of moving target for inspections. So some years they have been really tough on differentiation other use development of literacy. This is probably OFSTEDs biggest weakness. They seem to allow the government to rattle off new priorities every year with no change in official policy.
That’s another trendy OFSTED that seems to have come and gone