There are two broad theoretical explanations of how language is acquired. There is the behavioral approach which explains language development in terms of behaviorist principles. In contrast is the nativist approach which rejects behaviorism and considers language to be a native ability residing in each individual at birth. The behavioral approach is closely linked to the task-analytic model. According to this approach, speaking behavior of individuals is learned through modeling and various kinds of reinforcement.
Interventions are direct and systematic.
Weaknesses are assessed and then taught directly through example and not example, reinforcement, modeling and practice. Learning is broken down into small tasks. The instructor is the primary agent through which the student learns. Direct teaching is the preferred model.