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The last century of language teaching history, operating within this theory-practice, researcher teacher dichotomy, has not been completely devoid of dialogue between the two sides. We moved in and out of paradigms (Kuhn, 1970) as inadequacies of the old ways of doing things were replaced by better ways. These trends in language teaching were partly the result of teachers and researchers communicating with each other.
The custom of leaving theory to researchers and practice to teachers has become, in Clarke’s (1994) words, “dysfunctional”. What is becoming clearer in this profession now is the importance of viewing the process of language instruction as a cooperative dialog among many technicians, each endowed with special skills, such as program developing, textbook writing, measuring variables of acquisition, designing experiments, and the list goes on.
We are all practitioners and we are all theorists. Whenever that understanding calls for putting together diverse bits and pieces of knowledge, you are doing some theory building. Or, if you have observed some learners in classrooms and you discern common threads of process among them, you have created a theory. And whenever you, in the role of a teacher, ask pertinent questions about Second Language Acquisition (SLA), you are beginning the process of research that can lead to a theoretical statement.
(Brown, H.D. 2006. Adaptado)