In the past parents in the East Valley School District have had the final say in whether their child was held back a grade. But after the school board passed a new policy last month, the final determination now rests with the principal. The policy will take effect during the 2008-09 school year, said Jan Beauchamp, assistant superintendent for academics. Even though it's called a retention policy, it's really aimed more at getting students to participate in academic interventions such as after-school programs and summer school, she said. The policy was changed at the request of several principals, said East Valley Middle School Principal Mark Purvine. He was part of a group compiling statistics required by the federal No Child Left Behind law that noticed students who had been recommended for academic intervention but didn't participate continued to struggle years later. Students participating in summer school and other programs, meanwhile, showed gains.