This study brings together the fields of cooperative learning, second language acquisition, as well as second/foreign language teaching to create optimal schooling experiences for junior high school students. Integrating cooperative learning with the theories from the second language acquisition, i.e. the comprehensible input, the comprehensible output, the interaction and context, and the affective domain of motivation, the researcher hopes that this empirical study can provide a close link between cooperative learning and the communicative language teaching and, at the same time, propose guidelines for EFL teachers who wish to implement cooperative learning to enhance their students’ proficiency in English as well as motivation toward learning English.