School teachers are in a profession that offers little advancement, but there is reason to believe that teachers go through significant developmental changes during their teaching years. Information about human development, career development, teacher characteristics, and the occupation of teaching indicates the likelihood of significant teacher change during the teaching years. Little is known about the specific changes teachers undergo. A study to provide information about those developmental characteristics and influences is reported, including the components of: (1) a summary of the problem, methodology, and limitations; (2) a summary of the major findings; (3) a discussion of the results; and (4) a conclusion. To provide more complete information about teachers' personal and professional development, this study obtained teachers' perceptions of: (1) their own personal and professional development characteristics; (2) influences of the professional environment on development; (3) influences of the personal environment on development; (4) influences of supervisory practices on development; and (5) preferred types of school environment and supervisory practice to facilitate development. (CJ)