An instructional strategy that promotes co-operative learning. It is based on dividing information among students so that they must pool their information to complete a task. There are typically four steps: Students are assigned home groups and are given an overview of the task. Each home group member is given a different part of the task (e.g., a music selection, choreographic piece, or script, each divided into several parts) so that one student in each home group has the same information. The students with the same information then leave their home groups and form an expert group. The expert group members work together to gain sufficient understanding of their skill or information to teach it to others in their respective home groups (e.g., they might relate a sequence of events, choose relevant data, or decide on a main idea). Students return to their home groups, and each expert proceeds to share his or her expertise with the others. The home group is responsible for helping all its members understand the entire content and complete the task.