As many consumer and business decision makers are utilizing Spatial Decision Support Systems (SDSS), a thorough understanding of how such decisions are made is crucial for the information systems domain. This dissertation presents six chapters encompassing a comprehensive analysis of the impact of geospatial reasoning ability on decision-performance using SDSS. An introduction to the research is presented in Chapter I. Chapter II provides a literature review and research framework regarding decision-making using geospatial data. Chapter III presents the constructs of geospatial reasoning ability and geospatial schematization. Chapter IV explores the impact of geospatial reasoning ability on the technology acceptance of SDSS. Chapter V presents results of an experiment exploring the impact of geospatial reasoning ability on decision-making performance. Finally, Chapter VI presents a conclusion. Together these chapters contribute to a greater understanding of the impact of geospatial reasoning ability in relation to business and consumer decision-making. [The dissertation citations contained here are published with the permission of ProQuest LLC. Further reproduction is prohibited without permission. Copies of dissertations may be obtained by Telephone (800) 1-800-521-0600. Web page: http://www.proquest.com/en-US/products/dissertations/individuals.shtml.]