Research has suggested that both teacher expectations and student expectations can affect the individuals' own attitudes and behavior, as well as the behavior of those with whom they are interacting. The joint effects of teachers' expectations about students and students' expectations about teachers on the performance and attitudes of both participants was examined. Subjects were 120 female undergraduates. Half of the subjects were designated as teachers and were led to expect either a high- or low-ability student. The other half, acting as students, were led to expect a teacher of high or low competence. Teachers and students were randomly paired in an experimental teaching session. Results showed that student performance was a function of the teachers' expectation. Teachers' attitudes and rated competence were affected by their expectations regarding the student, and students' attitudes were affected by their expectations about the teacher. Results indicated that both teachers and students can concurrently hold expectations about their partner, and that such expectations affect their attitudes about themselves, the partner, and the entire teaching situation. (Author/NRB)