Forecasting demand for products and services is a major concern of businesses and of governments, yet there is much room for improvement in usual practice. We have added a link to a presentation by Scott Armstrong to the 3rd International Marketing Management Conference in Teheran on 21 January 2009 titled "Demand forecasting using evidence-based methods" that provides guidance on best practice. To watch the video and see the slides, visit the Education Page of this site, and you will find the talk in the Forecasting Courses section.