Abstract Geographic information system (GIS) can provide an optimal solution in case of site selection. Therefore, using GIS is a common practice for spatial decision support. The study area and the purpose of this study was to find the best location for a new Wal-Mart store in Washtenaw County, Michigan, USA. Population, distance from existing stores, land uses, and slope were factors that considered in this research. Moreover, these factors weighted, based on their importance. Then, by using the raster calculator, the best location for the new store was defined.

This survey research effort investigated the relationship between 11 selected Geographic Information System (GIS) functions and three (time, cost, and quality) highway and transportation construction-project success criteria. The population included engineers and information technology professionals in the United States who worked in the highway and transportation area. No significant relationship between GIS function use and construction project success criteria (time and cost) was found.