PACE is done one-on-one for two reasons. First, the activities need to be sequenced according to each student’s skill level. Each training task demands very specific skills. The student needs to be constantly challenged. If the task is too easy, it’s boring. But if it’s too hard, it’s frustrating. Procedures that are challenging will cause the most improvement.
Second, we need to provide immediate feedback. Students need praise when performing correctly as an incentive to keep working, and they need correction when making an error so they are aware of the mistake. Later, they learn to recognize and correct their own errors.