Advocates of TBI reject this model on the basis that (a) it doesn’t work; and (b) it doesn’t reflect current understanding of second language acquisition. They claim that students do not develop fluency or progress in their grammatical development through a P-P-P methodology. They also argue that second language learning research has shown that language learning results from meaningful interaction using the language and not from controlled practice.
With TBI the focus shifts to using tasks to create interaction and then building language awareness and language development around task performance.