This document discusses information systems and their types. It lists 7 common types of information systems: 1) Transaction Processing Systems, 2) Management Information Systems, 3) Decision Support Systems, 4) Group Decision Support Systems, 5) Geographic Information Systems, 6) Executive Information Systems, and 7) Artificial Intelligence. It also discusses the system development life cycle and factors to consider in system development like business processes, people, methodology, technology, budget, and infrastructure.