Not only is there a shortage of qualified science teachers in Kenyan secondary schools, but also teachers are leaving the profession to take up nonteaching employment. A substantial number of qualified graduate teachers leave the profession soon after entering it. This loss of qualified science teachers from the profession affects Kenya's economic development, particularly in the scientific, technological, and professional sectors. This study attempts to uncover factors that affect science teacher mobility. Tape recordings, observations, and field notes were used for data collection. Through interviews with both former and current teachers the study provides insight into teaching as a profession in Kenya. The study looks at attitudes toward teaching as a career, motives for entering teaching as a career, and reflections on the actual teaching of science in secondary schools as factors related to decisions to leave the profession. The information gained from this study is used to propose changes that might contribute to the retention of qualified science teachers and attraction of talented people to the teaching profession in Kenya. Chapters include: (1) "The Provision of Scientific and Technological Expertise in Kenya: A Problem"; (2) "The Kenyan Educational System and the Provision of Science Teachers"; (3) "The Mobility of Science Teachers: A Review of the Literature"; (4) "The Design of the Research"; (5) "Perceptions of Science Teaching as a Career in Kenya"; (6) "An Analysis of Teacher Expectations in the Context of Kenyan Society"; and (7) "Mobility of Teachers and Educational Policy in Kenya." Copies of interviews with a current and former teacher are appended. There are 104 references. (KR)