Non-Interface Hypothesis

Stephen Krashen's theory that explicit teaching of grammar is unnecessary. Krashen believed that with sufficient input, learners would naturally acquire target language grammar following the same process as in first language acquisition.

Criticism
The Non-Interface Hypothesis has been criticized as not resulting in accurate learning of grammatical structures.

Bruntt, Karen and Bryanne, Ulla. Handbook for Grammar Detectives, page 20.