This document, which primarily contains statistical tables of data, is designed to help teach secondary school students how to compare the power levels of 186 countries. The three indicators or measures of economic strength include a country's total population, total area, and per capita income, and they are used to determine power levels. A country's ranked position for each of these factors is added together to determine its power-factor. The smaller the power-factor, the more powerful a country appears to be. Suggestions are provided for use of this data in classroom settings. Tables include information about: (1) the alphabetical listing of countries' rank data for area population and income; (2) the countries in order of power-factor rank; (3) selected regional country groupings in order of power-factor rank; and (4) the power-factor ranks of countries which belong to the Council for Mutual Economic Assistance (COMECON), the Economic Summit Countries, the European Community (EC), the European Free Trade Association (EFTA), and the North Atlantic Treaty Organization (NATO). (JHP)