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 2… 009 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 (http://www.forecastingprinciples.com/index.php?option=com_content task=view id=6 Itemid=6) of this site, and you will find the talk in the Forecasting Courses section.