This document discusses several key concepts in public policymaking including the various actors involved such as legislatures, executives, judiciaries, interest groups, think tanks and media. It also examines the roles and relationships between these actors, as well as factors like political parties, citizens, and institutional arrangements that shape policy outcomes. Additionally, it analyzes Elinor Ostrom's institutional analysis and development framework, which uses an action arena concept to study how policy situations, actors, evaluation criteria and rules influence interactions and outcomes.