Krashen's theory of second language acquisition consists of five main hypotheses:
the Acquisition-Learning hypothesis,
the Monitor hypothesis,
the Natural Order hypothesis,
the Input hypothesis,
and the Affective Filter hypothesis.
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"Language acquisition does not require extensive use of conscious grammatical rules, and does not require tedious drill." Stephen Krashen
According to Schütz (2007) "The Input hypothesis is Krashen's attempt to explain how the learner acquires a second language... The Input hypothesis is only concerned with 'acquisition', not 'learning'. According to this hypothesis, the learner improves and progresses along the 'natural order' when he/she receives second language 'input' that is one step beyond his/her current stage of linguistic competence. For example, if a learner is at a stage 'i', then acquisition takes place when he/she is exposed to 'Comprehensible Input' that belongs to level 'i + 1'. Since not all of the learners can be at the same level of linguistic competence at the same time, Krashen suggests that natural communicative input is the key to designing a syllabus, ensuring in this way that each learner will receive some 'i + 1' input that is appropriate for his/her current stage of linguistic competence."
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