1) An information system is a set of interrelated components that collect, process, store, and disseminate data and information to meet an objective. 2) Information systems can be classified as either operations support systems, which process data from business operations, or management support systems, which provide information to support managerial decision making. 3) Key types of information systems include transaction processing systems, process control systems, office automation systems, management information systems, decision support systems, and executive information systems.