The volume addresses the tension-filled and theoretically delicate intersection of territorial and functional representation, which manifests in various forms of institutionalized and informal contacts between interest groups and parliamentarians. The contributions aim to illuminate the forms and variations of this exchange relationship, its societal and political-institutional frameworks, its determining factors, and its impacts. The first part of the volume focuses on the formal interest ties and informal contact patterns between representatives and associations. The second part discusses policy-specific cooperation patterns and networks concerning potential structuring of political will and decision-making. The third part is dedicated to the manifestations, norms.