In order to assess the effect of T-Group sensitivity training on teacher attitudes, 25 elementary and secondary school teachers were given the Minnesota Teacher Attitude Inventory (MTAI) both before and after a 10-week T-Group program. A control group of 16 teachers taking an inservice course in Iroquois Indian History was used. Results showed that the control group's test scores remained the same or decreased slightly, while the experimental group's scores increased five to 20 percentile points. The greatest increase was shown by secondary school teachers of academic subjects. It may possibly be inferred that the T-Group training caused the increase in scores, but further research must be done to determine whether this training causes any actual changes in the teacher's classroom behavior. One approach would be pre- and posttesting of student attitudes to the teacher undergoing T-Group sensitivity training. (Four pages of teacher comments on the T-Group experience are appended.) (RT)