Paul Nation is an internationally recognized scholar in the field of language teaching methodology. He is best known for creating the Four Strands framework, which identifies four key areas of language teaching focus: 1) meaning-focused input, 2) meaning-focused output, 3) meaning-focused learning, and 4) fluency development. The four strands establish guidelines for incorporating receptive skills, productive skills, explicit language learning, and practice/mastery of existing skills into language instruction to develop a student's proficiency. Nation created this framework to provide a comprehensive approach for applying the essential components of language learning.