Dr. Smith, a veterinarian, has hired Carlos as an assistant. On Carlos's first day at work, when the first client comes in with her sick cat, Dr. Smith shows Carlos the technique of holding a cat for its vaccination. First, Dr. Smith describes the technique, and then she demonstrates the process of vaccination. Later, when another client comes in with his cat, Dr. Smith asks Carlos to hold the cat and corrects his mistakes. This is an example of .