This paper provides an evaluative framework to clarify the similarities and differences in five purposes for which a computer may be used to aid instruction. Each purpose implies its own method of evaluation and each has a different set of effectiveness measures that highlight its unique value. The first four involve adding new skills or knowledge…

TALK (Talk Aid using pre-Loaded Knowledge) is a computer system linked to a speech synthesizer which enables nonspeaking people to engage in real-time social conversation. TALK provides categories of general comments that can be used whenever a suitable specific response is unavailable. Results are reported of a study evaluating effectiveness of…