This document discusses group investigation, a cooperative learning strategy where students work in small groups to investigate subtopics of a larger topic. It is comprised of 3-6 members who freely choose their subtopic. Characteristics include investigation, interaction, interpretation, and intrinsic motivation. Important aspects are grouping students based on capability and planning. Advantages include motivating participation and engagement, while disadvantages include inability to cover all material and difficulty assessing individuals. Implementation involves the teacher presenting a topic, students generating questions, organizing into subtopics, planning, investigating, presenting, and evaluating their projects.