A teachers' union has criticised the government's decision to replace Key Stage 1 Sats with a new one-on-one assessment system for reception-age primary school pupils.

The Reception Baseline Assessment (RBA) will be rolled out across all primary schools from September this year, the Department of Education (DfE) said on Wednesday.

The 20-minute assessment with a teacher is supposed to be carried out within six weeks of the new term and is designed to provide a starting point by which to measure children's progress.

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