This paper describes a study of ethical decision making by teachers and the application of resulting case studies to teacher education. The initial study examined ethical decision making and the professional ethical philosophy of 18 elementary, middle and secondary teachers from urban, small town and rural areas of Montana. Case studies of the experiences described by these subjects were prepared, and the resulting cases were used in the college classroom to prepare elementary education students for ethical decision making. The usefulness and accuracy of the case studies were evaluated by 34 in-service teachers. As a result of these activities, it is recommended that Montana Program Standards leading to certification of teachers be strengthened in the area of professional ethics, that thoughtful application of the code of ethics be emphasized in teacher training, and that instruction in education coursework include the use of case studies on applied ethics. Three appendices contain the letter of invitation to participate in the project; a table showing teachers interviewed by size and level of school, gender, and grade or subject taught; and the interview questions. (JPB)