This chapter discusses interest articulation and interest groups. It defines interest articulation as the process of expressing interests, needs, and demands by people and social groups. As societies become more complex, the number and methods of interest articulation have grown. There are four main types of interest groups: anomic, nonassociational, institutional, and associational. The chapter also describes three systems of interest group relations with government: pluralist, democratic corporatist, and controlled. It outlines legitimate and coercive channels that interest groups use to access policymakers and influence policy.