Final answer:
In the BST procedure, the learner should imitate the behavior after observing the model, following a process that involves attention, retention, reproduction, and motivation, with the likelihood of imitation increasing if the model's behavior is met with reinforcement.
Step-by-step explanation:
When using the Behavioral Skills Training (BST) procedure, the learner should have an opportunity to imitate the behavior as soon as possible after observing the model. This step in observational learning falls under 'reproduction', which is one of the components described by Bandura in the process of modeling. After paying attention to the model and retaining what has been observed, the learner is expected to imitate the demonstrated behavior. Through vicarious reinforcement, if the learner observes the model being rewarded for a behavior, they are more likely to reproduce that behavior themselves. Moreover, the learner's successive approximations of the desired behavior are reinforced until the behavior has been learned effectively.