Starting in the 1950s and 1960s,the Development of Process-Outcome Research

Starting in the 1950s and 1960s,the development of process-outcome research was influenced by the use of ____________________ as sources of data.

A) recordings of psychotherapy sessions and standardized measures for clients' and therapists' experience of the treatment process
B) responses to projective measures following treatment
C) standardized measures of experience of the treatment process reported by therapists and clients
D) recordings of psychotherapy sessions and interviews with family members to assess changes in the client