This document discusses subsystem politics in public policymaking. It describes how policymaking is divided among specialized committees and subcommittees in Congress and within government agencies. Bureaucracies are divided into smaller subunits that focus on specific policy areas, while interest groups also work to influence policies within their issue areas. One influential arrangement is the "iron triangle" between relevant committees, agencies, and interest groups who benefit each other. The document also categorizes types of public policy according to Theodore Lowi's typology, including regulatory, redistributive, distributive, and constituent policies, and how they differ in their structures, discretion levels, and relationships with outside groups.