Parents should have more reliable measures than Ofsted grades to compare schools in England, says a report from a new education think tank.
The EDSK report challenges the accuracy of grades such as outstanding, good or requires improvement.
Think tank director Tom Richmond says there is no evidence to support “summarising an entire school in a single number or phrase”.
But Ofsted rejected the claims about inspectors’ grades as “inaccurate”.
The report warns of a lack of consistency and reliability in the ratings given to schools.
It proposes that there should no longer be a single, overall grade, and instead parents should have a more detailed set of comparisons and information about schools.