This document discusses marketing information systems. It begins by explaining how information flows in markets similarly to blood in the body, and companies must collect this information to make strategic market decisions. It then discusses how firms must organize continuous information flows and marketing decision makers use this data to solve problems. It provides definitions of a marketing information system as a structured system to gather, analyze, and distribute needed market information to decision makers. The document outlines the components of an information system including internal records, marketing intelligence, marketing research, and decision support systems. It concludes by stating marketing information systems are important for anticipation, planning, efficiency and adapting to changes.