What is Comprehensible Input? - a brief definition
Stephen Krashen:
“We acquire language in only one way, when we understand messages, that is when we obtain “comprehensible input.” Thus, we acquire when we understand what people tell us or what we read, when we are absorbed in the message. More precisly, we acquire when we understand messages containing aspects of language that we are developmentally ready to acquire but have not yet acquired.”
Comprehensible Input explained from teaching perspective within B-SLIM
An excellent presentation about CI use in foreign language classroom from STARTALK website