teacher spends much classroom time explaining or demonstrating something
to the whole class, a small group, or an individual. Student resource
materials typically do not provide extensive explanations of concepts,
and students often need a demonstration in order to understand procedures.
student learning occurs through observing others. A demonstration
provides the link between "knowing about" and "being
able to do." Research reveals that demonstrations are most
effective when they are accurate, when learners are able to see
clearly and understand what is going on, and when brief explanations
and discussion occur during the demonstration (Arenas, 1988).