This study was conducted during the first semester of SY 1994-1995 at the Davao Oriental State College of Science and Technology, Mati, Davao Oriental to provide empirical facts on the effectiveness of Self-Learning Instructional Material (SLIM) in teaching Elementary Statistics to second year college students. A modified non-equivalent pretest-posttest control group design was used. Data was analyzed by means of ANOVA, ANACOVA, LSD and UL Index method for item analysis. Three methods of teaching namely: TSI-A (teaching using Traditional System of Instruction) which served as -the control, SLIM-B (teaching using SLIM plus faculty supervision) and SLIM-C (teaching using SLIM). Findings showed that SLIM-B was the most effective method of teaching Elementary Statistics thus confirming that the teacher factor still play a very important role in the learning process of students.