The Education (National Curriculum) (Assessment Arrangements for English, Welsh, Mathematics and Science) (Key Stage 1) (Wales) Order 2002
Section 356(1) and (2) of the Education Act 1996 places a duty on the Secretary of State to establish the National Curriculum by specifying, by Order, such attainment targets, programmes of study and assessment arrangements as he considers appropriate for each of the foundation subjects. That duty has been devolved and falls to be exercised by the National Assembly in Wales.