The document summarizes Marshall Scott Poole's adaptive structuration theory, which examines how group members both shape and are shaped by the structures within their group through their interactions. It discusses how Poole's research challenged the prevailing view that groups progress through predictable phases when making decisions. Instead, adaptive structuration theory posits that group dynamics are complex and that members can intentionally adapt rules and resources to influence outcomes. The document uses a hypothetical example of a communication theory class to illustrate key concepts of Poole's theory, such as how members' interactions can impact and be impacted by the group's structures.