A teacher-led commission is being set up to help primary schools in England find new ways of assessing their pupils' progress.
The previous system of levels, where pupils' progress was assessed against standards set by the national curriculum, has been scrapped.
Ministers argued this system was too "vague" and "misleading".
National tests for seven- and 11-year-olds based on the new national curriculum are also being drawn up.
The Commission on Assessment Without Levels will be led by former head teacher of the London Oratory School John McIntosh, who was also a member of the government's advisory committee on its review of the national curriculum.
Up until September 2014, schools used the national-curriculum levels to assess the progress of their pupils.