From 1968 to 1970, three separate studies of North Carolina science teachers were conducted in the areas of biology (N=177), chemistry (N=101), and physics (N=71). The three studies shared three major purposes, to determine: the academic preparation of the science teachers being investigated, (2) the relationship between the level of academic preparation and school size, and (3) the relationship between the level of academic preparation and the amount of supplement to the state salary schedule paid by the employing school district. A fourth study of advanced high school biology teachers (N=100) was conducted: (1) to determine the academic preparation of advanced biology teachers and other factors such as teaching loads and years of experience and (2) to compare the preparation of teachers of advanced biology with that of teachers of tenth-grade biology. Results of these studies are summarized in this document. Comments and recommendations are made in four areas: teacher certification, teacher preparation programs, school practices, and future research. (Author/DC)