No time is wasted on what is already known, or never likely to be used.
Trainees are available if an emergency arises during the period of training.
A trainee whose mind is on what might be happening at work is not learning. Trainees are more comfortable in the familiar surroundings of their workplace than among strangers. This minimises stress, a major impediment to learning. Training using the documents clients are already working with produces direct, immediately obvious and useable results. No waiting to see how new concepts work in practice.