Reported is the development and field testing of the Science Classroom Observation Form (SCOF), an instrument focusing on the interactive characteristics among students, the environment, and teacher in elementary and junior high school science classrooms. This instrument was developed to be used in research investigations of openness and inquiry orientation. The data from field tests resulted in SCOF IV which consists of 39 statements or questions about characteristics of science classroom interactions, each rated on a 5-point scale following classroom observation. Items are grouped into "environment,""teacher," and "student" for observer convenience. SCOF has been used in 43 junior high school science classrooms in the Province of Saskatchewan. This report includes descriptive statistics of those data as well as a discussion of the results of factor analysis of the SCOF instrument. Validity and reliability are also discussed. A copy of the instrument is included. (PEB)