Effective teachers are proficient in using cooperative learning and graphic organizers as well as understanding when these strategies should be implemented and with Who. The three educational outcomes of cooperative learning are academic achievement, tolerance and acceptance of diversity, and the development of social skills. In addition to these outcomes, cooperative learning can benefit both low- and high-achieving students by having them work together on tasks. According to Arends, “the cooperative learning environment sets the stage for students to learn valuable social skills that can be used throughout life” (p. 371-372). However, although cooperative learning may seem very effective in a particular lesson, a different approach may be better suited to another lesson (Marzano et al., 2015). Another strategy that an effective teacher can practice is problem-based learning. This involves exposing students to meaningful situations to promote their research and inquiry (Miller, 2012). An effective teacher must know which strategy is best suited for each lesson or