The goal of every intelligence service is to produce reports consisting of evaluated information and forecasts that political, military, and government leaders can use in decision making. There are three categories of intelligence operations: strategic intelligence, tactical intelligence, and counterintelligence. Strategic intelligence agents keep track of world events, watch foreign leaders carefully, and study a foreign country’s politics, economy, military status, and scientific advances. Tactical intelligence consists of determining which groups hold power and looking at foreign policy, public opinion, and voting statistics. Economic factors include trade agreements, the gross national product, and possible famines, all of which can influence domestic and foreign policies. Counterintelligence consists of keeping valuable information away from the enemy and prevents subversion and sabotage.