Theory of second language acquisition

Theories of second-language acquisition are various theories and hypotheses in the field of second-language acquisition about how people learn a second language. Research in second-language acquisition is closely related to several disciplines including linguistics, sociolinguistics, psychology, neuroscience, and education, and consequently most theories of second-language acquisition can be identified as having roots in one of them. Each of these theories can be thought of as shedding light on one part of the language learning process; however, no one overarching theory of second-language acquisition has yet been widely accepted by researchers.

As second-language acquisition began as an interdisciplinary field, it is hard to pin down a precise starting date. However, there are two publications in particular that are seen as instrumental to the development of the modern study of SLA: Pit Corder's 1967 essay The Significance of Learners' Errors, and Larry Selinker's 1972 article Interlanguage. Corder's essay rejected a behaviorist account of SLA and suggested that learners made use of intrinsic internal linguistic processes; Selinker's article argued that second-language learners possess their own individual linguistic systems that are independent from both the first and second languages.

In the 1970s the general trend in SLA was for research exploring the ideas of Corder and Selinker, and refuting behaviorist theories of language acquisition. Examples include research into error analysis, studies in transitional stages of second-language ability, and the "morpheme studies" investigating the order in which learners acquired linguistic features. The 70s were dominated by naturalistic studies of people learning English as a second language.

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