This comprehensive guide explores the role of information systems in various functional areas of organizations. It delves into different types of information systems, including Transaction Processing Systems (TPS), Management Information Systems (MIS), Decision Support Systems (DSS), and Executive Information Systems (ESS). The guide examines the information needs of different functional areas like operations, marketing, finance, and research & development, and evaluates the suitability of information systems for each area. It also discusses current trends in using information systems to solve business problems and provides examples of how these systems can be implemented to improve operational efficiency and decision-making processes.