This bulletin discusses certain supervisory services for improvement of the professional equipment of teachers; instances of adaptations of supervision by which the results of research are utilized and teachers are interested in experimentation; illustrations of specific improvements in the approach made by supervisors toward the solution of certain problems; and suggestions concerning developments along the above lines for the near future. This study of developments in supervision discloses encouraging evidence of progress in improving the professional equipment of teachers, in utilizing results of research, and in selecting more intelligent approaches to the solution of instructional problems. (Contains 6 footnotes.) [Best copy available has been provided.]