A response may have more than one product. The same writing that produces marks on a piece of paper also produces visual stimuli related to arm movements; we can see that someone is engaged in writing. Furthermore, if it is quiet, some auditory stimuli may be produced as a result of the friction between pen and the paper. Additional response-products may be private; the movements resulting from writing also produce kinesthetic stimulation to which the writer may be able to react.
A stimulus with the following features:
It is the result of someone’s behavior
Formal or dynamic characteristics of the stimulus (e.g., mode or intensity)
Formal or dynamic characteristics of the response that produces it
The function of the stimulus (e.g., discriminative, reinforcing)