Gordon Pask (1928–1996) British psychologist
Using the argument which relates the information available about conscious processes to the type of experimental situation, we maintain that the basic unit of psychological /educational observation is a conversation. In order to test hypotheses and explicate the conversational transactions, it is necessary to invoke various tools and explanatory constructs. These are coherent enough to count when interlocked as a theory, and this theory was dubbed conversation theory.
Source: Conversation Theory (1976), p. 3.