This document provides an introduction to the study guide for the course "Comparative Political Systems" for MA Political Science students at the University of Calicut School of Distance Education. It outlines the 7 modules that will be covered in the course, including the Nature, Evolution and Scope of Comparative Politics, Theories of Comparative Politics, Federalism and Constitutionalism, functions of government, interest groups and party systems, bureaucracy, and a comparative analysis of political systems in the UK, USA, France, Russia, and China. It also lists the authors who prepared and reviewed the material. The course uses a comparative approach to analyze different countries' political institutions and processes.