This document discusses research-based instructional strategies and lists Robert Marzano's top nine teaching strategies ranked by their effect size on student achievement. The top strategy is comparing, contrasting, classifying, analogies, and metaphors, which has an effect size of 1.61 and increases student achievement by 45 percentile points. The second strategy is summarizing and note-taking with an effect size of 1.0 and 34 percentile points. The third strategy is reinforcing effort and giving praise with an effect size of 0.8 and increases achievement by 29 percentile points.