Using data collected from 4,042 lessons taught by 19 student teachers, this report examines the extent and purpose of media utilization by student teachers who were completing field experience requirements for teacher certification in 15 Saskatchewan schools during the fall semester of 1981. Following a description of the problem and methodology, a literature review section discusses theoretical background, prescriptive and descriptive research viewpoints, previous approaches to research, findings of previous studies, ethnography, teacher planning practices, and an area of concern generated from the literature. Procedures for the study, which used an ecological approach, are next described; they included participant observation, student teacher interviews, and lesson plan log book entries. Data, the subject of the fourth section, were analyzed to determine what media were used, how media were used, and factors affecting media utilization. A six-page reference list is provided. Appendices include a list of the Canadian School Library Association recommended media standards for library demonstration schools, which was used as a survey instrument; a sample of the structured log book record; and interview questions. Forty-three figures are included. (LMM)