The Alternative Learning System (ALS) is a non-formal education program implemented by the Department of Education in the Philippines. It provides free education to out-of-school youth, adults, and other groups who cannot attend formal schooling. ALS uses modular courses and "mobile teachers" who teach in communities. It aims to give equivalency certificates upon passing accreditation exams to allow graduates to pursue further education or jobs. The document describes the various ALS programs that target different groups, how ALS works, comparisons to formal education, and changes being made to ALS under the K to 12 program.