This document discusses collecting information and forecasting demand for marketers. It describes monitoring macro trends, micro effects, and competitors. Marketers gather sales, price, cost, and inventory data from various systems. They analyze customer databases and use data mining to gain insights. Forecasting involves considering needs, trends, and megatrends. Marketers evaluate total market potential and available market share using various methods to breakdown demand. Accurate forecasting requires collecting ongoing happenings data from various sources.