Generally, cooperative learning requircs that mixe-ability students work together to accomplish a set of tasks. Student are placed in task groups composed of high, middle, and low learner. The percentage of each level that is represented in the group generally approximates the percentage of that level in the whole class. Rewards to individual students are usually based on the performance and accomplishment of the whole team rather than on that of individual team members, which provides an incentive for students to work together productively. Advantages associated with cooperative learning include: (1) higher academic achievement than is generally achieved with other commonly used approaches, (2) development of better interpersonal relationships, (3) increased time on-task, and (4) development of more positive attitudes toward the subject and classroom.