What is the type of cooperative learning where students practice a skill until mastery?

The type of cooperative learning that involves students practicing a skill until mastery is best represented by the concept of Student Team Achievement Decisions (STAD). This approach emphasizes collaboration among students in small groups, where they work together on specific tasks or skills, providing support and encouragement to one another.

In a STAD framework, each student is responsible for their own learning, but they also rely on the collective effort of the group to achieve mastery of the material. This focus on skill mastery highlights the importance of repeated practice and peer support, allowing students to guide and assist one another as they work towards a common learning goal.

In contrast, other options such as Problem-Based Learning focus on exploring real-world problems and developing critical thinking skills rather than specific skill mastery. Collaborative Group Work can involve various activities without necessarily centering around the mastery of a single skill. Peer Tutoring, while effective in providing individualized support, does not inherently involve the structured team dynamics and collective achievement focus present in STAD.