A description and evaluation of an environmental science inservice education program for teachers of grades 4-6 from central Texas is described. Participants attended 32 class sessions which involved lecture, demonstration, seminars, laboratory work, and discussion. Two full-day and four half-day field trips were also part of the program. The goals of the program were to increase teachers' environmental science knowledge, to help them identify and use appropriate resource materials, and to promote cooperation between the University of Texas at Austin and teachers. Program participants also conducted inservice workshops for their own schools and school systems resulting in a multiplier effect. In order to obtain formative and summative evaluation data, program participants responded to three instruments: one to assess teachers' concerns and changes in concerns about the inservice program, one to measure their attitudes towards science, and another to measure gains in environmental science knowledge. Instruments were administered three different times: pre-treatment, mid-way (16 weeks), and post-treatment (32 weeks). A control group was used. Findings indicate that participants' attitudes changed positively, that they demonstrated a significant increase in knowledge, and that they experienced personal growth and development. (DC)