Big Teens is an exciting, three-level series written specifically for adolescents who have already studied English in their elementary school years and who need to increase their command of the language. The series is based on communicative, constructivist language acquisition process, featuring songs, chants, social practices, strategies, cooperative learning, self-assessment, and hands-on projects. Big Teens contains discovery activities and additional contextualized practice activities to help facilitate students constructing the language. Big Teens is written by Mario Herrera, one of the best and respected names in ELT whose books are used by millions of students around the world.