The document discusses several types of information systems used in businesses: 1) Transaction Processing Systems (TPS) are used to collect, modify and retrieve transaction data and ensure performance, reliability and consistency. 2) Office Automation Systems (OAS) are used by office workers to digitally create, store and share information needed for daily tasks. 3) Knowledge Work Systems (KWS) are similar to OAS but serve knowledge workers like scientists and engineers who create new information. 4) Decision Support Systems (DSS) support decision making in businesses and organizations. 5) Executive Support Systems (ESS) help senior management with non-strategic decisions. 6) Group Decision Support Systems (GD