ISPAS (Interactive Site Planning and Analysis System) is a computer-aided procedure developed for the purpose of aiding the small scale site planner in performing site analyses and plan evaluations. An interactive approach allows the system to be easily adapted to the site planning process. The system utilizes both previously developed software, including the Harvard base programs of GRID, ATTRACTIVENESS, IMPACT, and VIEWS, and newly developed software. The ISPAS system provides a decision-aiding device which allows the small scale site planner to perform more in-depth site analyses and to develop more sophisticated site designs. It also enables him to perform these functions in much less time and at a greatly reduced cost over other procedures now being implemented in the site planning process. The five phases implemented as part of the ISPAS system include: 1) Data Acquisition and Coding, 2) Site Selection, 3) Site Analysis, 4) Site Development, and 5) Plan Evaluation. Under the data acquisition and coding phase, the user collects data from source maps using a digitizer and extrapolates additional data from this source. The data is then converted to a grid format for mapping purposes. In the site selection phase, the user implements the ATTRACTIVENESS program to determine the suitability of various sites for a particular type of development. More in-depth analyses are conducted in the site analysis phase using the ATTRACTIVENESS and IMPACT programs. The site development phase allows the user to input alternative site designs for evaluation in the final phase. / M. Arch.