In which method does a trainer complete all but the last behavior in a chain?

The method in which a trainer completes all but the last behavior in a chain is known as backward chaining. This technique emphasizes teaching a complex skill by starting from the end goal and working backwards to the beginning of the task.

In backward chaining, the trainer performs all the steps except for the last one, allowing the learner to complete that final step. This not only helps the learner experience a sense of accomplishment right away but also reinforces all preceding steps as part of a meaningful sequence. This method is particularly effective because it helps to build the learner's confidence and motivation by allowing them to work towards completing the task successfully from the very beginning. It also leads to better retention of the entire sequence since the learner starts with the conclusion of the task.

By contrast, the other methods listed, such as forward chaining and total task chaining, focus either on teaching from the beginning of the sequence or requiring the learner to engage in the whole task at once, without providing the same gradual buildup to success that backward chaining facilitates.