Many 11-year-olds in England may not have to sit their Sats in May this year because some teachers have voted not to take part in them.
Two of the main groups which look after teachers' interests took a vote, and the majority of teachers said they didn't want the Sats to go ahead.
But some pupils will still have to sit them if their head thinks it's best.
Around 600,000 11-year-olds in England are due to take their Maths and English Sats between 10-14 May.
Many teachers have voted not to support Sats because they think they are bad for children, teachers and schools.
They believe that Sats cause everyone too much stress, and that schools end up teaching kids how to pass exams, rather than concentrating on helping them learn different subjects.
The headteachers who support the action will ask their teachers not to open any Sats papers, not to check them and not to carry out the tests.
The teachers and pupils will all still be in school on the days the Sats are supposed to take place, but the tests won't happen.
The two teachers' unions which have voted against Sats in May are called The National Association of Head Teachers (NAHT) and the National Union of Teachers (NUT).