This study documents the use of the Draw-a-Science-Teacher-Test as diagnostic tool for both preservice teacher beliefs about science teaching and science methods course effectiveness. Direct comparison of pre-course to post-course images from 50 preservice elementary teachers was undertaken using McNemar's test. Results indicated statistically significant shifts in participants' mental models of science teaching and learning. Post-course more students portrayed student-centered reform minded practices. The limitations of this analytical approach, the practical significance of this work, and ideas for future research in this arena are discussed.