A 2003 article by Klapper about task-based language teaching, PPP and much else. Clear and interesting. researchgate.net/publication/24…
“If it is possible to say anything with certainty about how languages are learned, it is surely that there is no single, all-encompassing model. Acquisition-based theories have much to tell us about the process, but so too do cognitive approaches.”
“Language teachers should see their professional education as consisting... in a constant questioning of methodology, in the knowledge that ‘there can be no “one best method”... which applies at all times & in all situations, with every type of learner” (Mitchell and Myles, 1998)
