Seven-year-olds in England take tasks and tests in reading, writing and maths, in which they are expected to reach level 2.
Last year 84 per cent managed this in reading, 81 per cent in writing and 90 per cent in maths.
As well as the task and test results, teacher assessments for English and maths are published. Under the pilot project, schools have to report only the teacher assessments and not the test results, but they must still do most of the tasks and tests in order to "arrive at a secure judgment".
For schools not in the pilot, the reading and writing tasks can be given at any time from January to four weeks before the end of the summer term. But tests must be done in May.
Schools in the pilot, were given the option of sticking to the 2004 timetable, or carrying out the 2003 tasks and tests at any time during the school year.
There are different tests and tasks for different abilities and pilot schools were given more flexibility over which to administer.