They're opposed to standardized tests for many reasons and don't want kids taking them.
Some say they're being used to measure teacher performance and fear testing narrows the curriculum.
This year, teachers, students and parents from a Seattle high school refused to administer or take a standardized test. In response, the Seattle schools superintendent now says schools can choose not to administer the tests.
Robert Schaeffer of the nonprofit National Center for Fair and Open Testing says the consequences of opting out of standardized tests vary from state to state. He says so far there have been very few consequences for children, but that might change.