Britannica Educational Publishing 
Political Systems, Structures, and Functions [PDF ebook] 

Governance is a complex process, often divided among various structures and institutions. Local, regional, national, and even supranational entities each have their own formal and informal institutions that comprise a political system. Readers will use this comprehensive volume to examine the various types, structures, and functions of government around the world, as well as the evolution of political systems and the factors contributing to their rise and fall.