Mark has been working at QuickLube for six months. He started the job already knowing how to change oil in cars, but now the company is expanding the job to include brake checks and brake replacement. His manager is an expert at all things car-related, so during his shifts for a week, Mark is instructed and his manager assists him in checking and replacing the brake pads on twenty cars. He now feels pretty confident about this new skill because of the hands on training he received. This is an example of: