Everything You Always Wanted to Know about Forecasting

"The Principles of Forecasting site summarizes all useful knowledge about forecasting so that it can be used by researchers, practitioners, and educators. (Those who might want to challenge this are invited to submit missing information.) This knowledge is provided as principles (guidelines, prescriptions, rules, conditions, action statements, or advice about what to do in given situations). The evidence-based principles apply to

-operations research, and
-social sciences...

The Forecasting Principles site is provided as a public service. It was created in 1997 by Professor J. Scott Armstrong and is maintained by the Marketing Department of the Wharton School. The International Institute of Forecasters and Kluwer Academic Publishers provide partial funding."

Check it out.