A Timeline of Major Theories/Theorists in Applied Linguistics By jongeense Apr 4, 1957 Behaviorism, BF Skinner Major theorist - BF Skinner Apr 4, 1959 Universal Grammar, Chomsky Apr 4, 1962 Speech Act Theory, Austin Apr 4, 1965 Constrastive Analysis Hypothesis, Various Scholars Apr 4, 1972 Communicative Competence, Hymes Apr 4, 1973 Meaning Potential, Halliday Apr 4, 1978 Zone of Proximal Development, Vygotsky Note, originally developed in the 1930s, and formalized in 1978 Apr 4, 1981 Competition Model, MacWhinney Apr 4, 1982 Monitor Model, Krashen Comprehensible Input part of the model! Apr 4, 1985 Output Hypothesis, Swain Apr 4, 1987 Subtractive Bilingualism, Lambert Apr 4, 1990 Long, Interaction Hypothesis Apr 4, 1990 Noticing Hypothesis, Schmidt Apr 4, 2000 Cummins, BIC/CALP Apr 4, 2005 Ellis, Usage-based