The Montana PNA Web Tool was developed by Bach Harrison LLC in collaboration with the Montana Department of Public Health & Human Services, Addiction and Mental Disorders Division, Prevention Bureau. Montana DPHHS has been administering the biennial MPNA Survey youth prevention/health projects since 1998. The survey focuses primarily on grades 8, 10, and 12 (though schools are given the option to survey students in grades 7, 9, and 11 if they so choose). This web tool focuses on grades 8, 10, and 12 only.