1) An antecedent that induces a person to perform a behavior that otherwise does not occur.

2) An added stimulus in a discrimination-training procedure designed to increase the probability of a person's making the correct response.

3) An auxiliary discriminative stimulus presented in order to occasion a given response. Prompts usually are faded before the terminal goal is judged to have been achieved. (For example, the f sound serves as a prompt in "2 + 2 are f - . " The f sound must be faded completely to conclude that the student has achieved the goal of knowing how to add 2 + 2.)

4) A supplemental stimulus that raises the probability of a correct response.

5) A supplementary stimulus to help a student respond. For example, if a student cannot remember a technical term we can give a prompt by, for example, telling him or her the first letter. Note that later prompts are "faded" so that the student eventually responds without them.