“The best methods are therefore those that supply ‘comprehensible input’ in low anxiety situations, containing messages that students really want to hear. These methods do not force early production in the second language, but allow students to produce when they are ‘ready’, recognizing that improvement comes from supplying communicative and comprehensible input, and not from forcing and correcting production.”
Stephen Krashen
REFERENCE
SHÜTZ, Ricardo. Stephen Krashen’s Theory of Second Language Acquisition. April 1998. Available on: <https://www.sk.com.br/sk-krash.html> Access on Nov 24th, 2018.
Krashen's Second Language Acquisition Theory 