Teachers of political science, social studies, and economics, as well as school library media specialists, will find this resource guide invaluable for incorporating the Internet into their classroom lessons. The guide references over 150 primary Web sites and pairs them with questions and activities designed to encourage critical thinking skills. The activities will allow students to evaluate the source of information, the content presented, and its usefulness in the context of their assignments. Along with each Web site, a summary of the site's contents identifies important primary source documents such as constitutions, treaties, speeches, court cases, statistics, and other official documents. The guide is divided into the following sections: "Introduction"; "Using Critical Thinking in Political Science, Economics, and Contemporary World Issues"; "Using Primary Sources"; "Primary Source Sites"; "Political Science" ("Early America"; "Revolutionary Period and Early U.S. Documents"; "The Nineteenth Century"; "The Twentieth Century"; "The Judiciary Branch"; "The Presidency and the Executive Branch"; "Legislative Branch"; "Elections and the Voting Process"; "International Politics"); "Economics" ("General Economic Data"; "International Economics"; "Economic History"; "Macroeconomic Data"; "Other Economic Sites"); and "Contemporary World Issues." (Contains a list of selected primary source databases.) (BT)