BERA's analysis of the proposed baseline assessment for Reception children does not look favourably on the intended system. They say: "In the panel’s view the proposed baseline assessment will not lead to accurate comparisons being made between schools, as policymakers assume. Perhaps most importantly, they will not work in the best interests of children and their parents."

You can read the full report here: A baseline without basis. The validity and utility of the proposed Reception baseline assessment in England. You can discuss BERA's report on this thread.