Interrelated disciplines that enhance the understanding of civil services for UPSC aspirants include political science, public administration, economics, and sociology. These subjects provide critical insights into governance mechanisms, policy formulation, and societal dynamics, enabling candidates to grasp the complexities of public administration. For instance, political science offers knowledge of theories behind governance, while public administration focuses on the practical aspects of management and bureaucracy. Economics examines resource allocation and development issues, and sociology emphasizes social structures and issues, promoting awareness of community needs. Together, these disciplines create a holistic understanding essential for civil service roles.