This study, conducted in Indiana, describes sources of teacher supply, various paths individuals take into teaching, and how the paths have changed over time. Findings are based on: a computerized file containing a record for each Indiana teacher from 1965 to 1988; a survey of all Indiana teachers who taught in school year 1987-88, but not in the previous year; and a survey of new 1988-89 hires. New and returning teachers are profiled and paths to teaching are detailed. The objectives of the study are: to assess the current teacher supply and demand in Indiana; to determine and recommend policies that will ensure an adequate supply of certified teachers; and to provide the Indiana State Department of Education with the capability of monitoring and performing future assessments of teacher supply and demand. Following a preface, summary, acknowledgements, figures and tables, the report is organized into four sections: (1) Introduction; (2) The Changing Profile of Newly Hired Teachers; (3) Profile of Teachers in the Survey Sample; and (4) Conclusions including historical trends, survey results, and policy implications. A survey of newly hired teachers in Indiana public schools, 1988-89, and a 1989 Indiana teacher survey are appended. (LL)