A proposed state constitutional amendment would bar tenure for Missouri's school teachers.
The proposed initiative petition was filed Tuesday with the secretary of state's office. It could appear before voters in November if supporters gather between 147,000 and 160,000 signatures from supporters.
Some Missouri lawmakers say the state should do away with its tenure system for teachers and make students' academic performance a big part of their evaluations.
A House panel heard testimony Wednesday on legislation that would require 50 percent of a teacher's evaluation to be based on students' scores on state tests. Teachers would not be guaranteed salary increases based on their classroom experience. The changes would take effect in July 2012.