Data indicate that although science is required of all students in elementary school, elementary teachers do not usually teach science as a high priority or in a way that enhances student achievement. A myriad of possible causes for existing voids in this teaching process have been suggested by researchers. Teacher belief systems have been neglected as a possible contributor to behavior patterns which affect science teaching, therefore its investigation is vital to a more complete understanding of teacher behavior. This publication reports on a pilot and a major study in which the combined Personal Science Teaching Efficacy Belief scale and the Science Teaching Outcome Expectancy scale instrument (STEBI) was administered to measure self-efficacy or outcome expectancy. Results of a plot graph illustrated two homogeneous scales for the try-out study. Results of the major study indicate that the STEBI is a valid and reliable tool for studying elementary teacher's beliefs toward science teaching and learning. References, means and standard deviations, corrected item-total scale correlations and factor loadings, factor plot of final factor analysis results, demographic characteristics, final scales, validity coefficients, and scoring instructions for the STEBI are included. (RT)