Setting of economic modeling systems developed in-house for the United States, several countries, and the world, and a number of systems developed in commercial software tools: a cross-sectional analysis system, a historical economic data pattern analysis system, tools for seasonally adjusting data, a mathematical computations engine, a large-scale database, and e-mail. Forecasting at the Fed utilizes scientific principles but also includes personal insights, knowledge, and intuition. Greenspan has a good sense of how much to trust statistics and how much to trust his intuition.