To increase the value of teacher inservice workshops, the authors of this paper suggest obtaining teacher participation in the selection of workshop topics and interviewing teachers to determine their utilization of the methods presented in the workshops. Noting that participants found fewer than half of 52 selected workshops both necessary and desirable, the authors propose the use of a standard form and personal contacts to learn what teachers want to study. When teachers fail to see the need for workshops deemed necessary by administrators, it may prove more useful to convince the teachers of the need than to schedule a workshop and require uninterested teachers to attend. Application of the "Levels of Use" interview technique can inform administrators of the effectiveness of the inservice programs. In personal interviews with workshop participants, interviewers can collect information concerning the number of teachers implementing the new program, the level of implementation, modifications made in the program, and problems encountered using the program. The interviews also reveal teacher attitudes about the effectiveness of various aspects of the workshops and permit future inservice programs to be altered. Three cases in which this interview technique was employed are described to illustrate the concept's usefulness. (PGD)