This document discusses market measurement and forecasting. It defines key terms like market measurement, market forecasting, demand forecasting, and different levels of market measurement. It also describes methods of measuring markets like total market potential, area market potential, and total industry sales/market shares. Common forecasting methods include those based on judgment, like expert opinions, intentions surveys, role playing and conjoint analysis. Statistical methods involve analyzing historical data patterns. Accurate measurement and forecasting is important for business decision making.