This third edition of the World Handbook of Political and Social Indicators is composed of four files, one aggregate data file (Part 1), and three events data files including a daily events political data file (Part 2), an annual political events data file (Part 3), and a new quarterly political events data file (Part 4). The aggregate data file (Part 1) is based upon data from the base years of 1950, 1955, 1960, 1965, 1970, and 1975. It contains political, economic, and social data and rates of change for 155 countries.