This document summarizes and analyzes factors related to measuring complexity in urban living. It discusses how cities have become prime agents of development and face challenges from urbanization and globalization. It also examines the need to measure and monitor cities using rankings as a tool. Key statistics are provided on economics of cities and how their role and competitiveness has changed with globalization. The document concludes by outlining a proposed City Development Index to quantify and compare qualities of life across urban areas.