The Interaction Hypothesis, developed by Michael Long, argues that meaningful communication helps learners acquire a second language by making input more comprehensible and encouraging learners to modify their output. This article explains negotiation of meaning, feedback, modified input, modified output, and the role of interaction in language learning and teaching.
Rod Ellis, a leading figure in second language acquisition (SLA), is best known for his contributions to task-based language teaching (TBLT), form-focused instruction, and the distinction between explicit and implicit knowledge. His research bridges theory and practice, shaping modern language teaching methodologies and providing educators with practical, evidence-based strategies.