In examining the role and responsibilities of the student teacher supervisor, the following demands, or constraints inherent in the job are discussed: (1) the content, skills, and dispositions students are expected to acquire and strengthen, and the aims and objectives the supervisor wishes to set; (2) the level of mastery and competence the supervisor expects students to attain; (3) the affective quality of supervision, student relationships the supervisor intends to establish and maintain, and the feelings within the students the supervisor intends to engender; (4) assessment, grading, marking or other types of evaluation of students' performance in teacher practice and the amount and type of feedback given to students with respect to their own performance; (5) the characteristics of the teaching, classroom and school situation in which students' teaching practice occurs; and (6) the allocation of time for teaching practice and the whole course. It is pointed out that these demands often conflict with each other and not all of them can be satisfied at the same time. Suggestions are made for further research on student teacher supervisors. (JD)