Although a significant number of trips are made by foot in developing cities, pedestrian infrastructure, amenities, and services are often neglected in municipal planning and budgets. Since helping city planners understand the scope and extent of local pedestrian conditions relative to other cities would be a positive step towards improving the quality of the pedestrian environment, I was retained by the World Bank to devise a walkability index, which would rank cities across the world based on the safety, security, and convenience of their pedestrian environments. To accomplish this task, I first generated a list of Index variables by studying existing tools for evaluating non-motorized transport and by consulting experts from a variety of related fields. After considering different methods for survey area selection, field data collection, and data aggregation, I created prototypes of the index and survey materials and organized field tests in cities throughout the world, including Beijing, Washington, and Delhi. I also oversaw a full-scale pilot in Ahmedabad, India, where 65 volunteers from the Centre for Environmental Planning and Technology (CEPT) conducted physical infrastructure, public agency, and pedestrian surveys in eight neighborhoods, which were selected using a random spatial sampling method. Results from these tests and pilot were used to refine the Index composition and data collection methodologies, resulting in a two-pronged tool. Since, out of practical necessity, the Global Walkability Index's robustness is limited by its simplicity (the Index is primarily intended to generate awareness of walkability as an important issue),