Cristeta B. Blanco proposes conducting an action research study to improve 4th grade students' mastery of science at Tomas Morato Elementary School in Quezon City, Philippines. Science is one of the lowest achieving subjects and is taught in English, which poses difficulties. Blanco aims to use Strategic Intervention Materials (SIM) and other audiovisual aids during intensive remedial instruction from August to March. The study would assess students' mastery before and after the intervention using SIM pre- and post-tests. If successful, the study could benefit students, teachers, parents, administrators, curriculum planners and future researchers.