This document provides an overview of marketing information systems and demand measurement. It discusses the key components of a marketing information system, including the internal records system, marketing intelligence system, marketing research system, and marketing decision support system. Various methods for estimating current and future market demand are also outlined, such as total market potential, area market potential, and analyzing past sales trends. The document also discusses how marketing information systems are currently practiced in Nepal, noting that while large multinational companies utilize such systems, they are not widely used overall in the country.