How do the principles of systems work show up in the day-to-day activities of organizations? Chapters 4 to 7 describe four practices of systems work, demonstrating how the principles from Chapter 3 are put into action. Chapter 4 describes a key role for organizations, which is to cultivate collectives comprised of primary actors: people who are immersed in a social issue and who often have lived experience of the social issue itself. It is a seemingly innocuous role that can have profound consequences. The organizations visited for the research are each doing this in different ways, yet with similar objectives. Through peer groups, incubators, learning circles, committees, and numerous other structures, these organizations are cultivating collectives that enable individuals, families, and groups to gain new perspectives while learning together—ultimately creating an action system for broader change.