Input, interaction, and output

This chapter explores three central concepts in language acquisition, input, interaction, and output, and considers their implications for foreign language (FL) teaching. It outlines how caretaker talk and other simplified codes provide comprehensible, appropriately tuned input for first-language acquirers, and examines Krashen&s;s Input Hypothesis, including the role of the silent period. The chapter then shifts to Long&s;s Interaction Hypothesis, emphasizing how negotiation of meaning helps learners comprehend language slightly beyond their current level. Swain&s;s Output Hypothesis is also discussed, highlighting how producing language pushes learners to process linguistic forms more deeply and supports noticing. The chapter further explores why some learners progress while others fossilize, considering communicative and integrative motivations. Throughout, parallels are drawn between L1 and FL acquisition, encouraging reflection on how teachers might adapt aspects of naturalistic acquisition – such as modified input, interactional support, and opportunities for meaningful output – to enhance classroom learning.