This text focuses on decision-making and problem-solving with Lotus 1-2-3 for Windows software. Students can learn how to build and interact with a decision support system (DSS). The text can be used for undergraduate, hands-on, spreadsheet courses, using Lotus for Windows, Release 4.0, software or as a supplement in a Management Information Systems/Decision Support System course. Decision support system (DSS) methodology covers DSS components and analysis techniques, as students learn to make informed decisions. Methods and techniques are balanced with the tools students need to make decisions. An integrated case study, based on an actual business, provides students with an opportunity to confront and solve a variety of business problems. Quality is emphasized by a quality-assurance checklist in each chapter, hint sections and a chapter on spreadsheet hygiene. The text includes screen displays, review questions, skill-building activities, hands-on exercises and problem-solving projects.