- The information selected for the criteria has to match with available map data in order to apply the method. If map data is not available then it is necessary to painstakingly acquire / digitize the relevant map data first before the next step can be undertaken. This can be a time consuming and costly task.
- Defining appropriate selection, exclusion or buffering criteria often proves to be quite difficult. Generally speaking, the result produced by the GIS is only as good as the quality of the previously selected criteria. Therefore, planners must be familiar and practiced in defining the most appropriate criteria.
- Poor quality data (including map data) may lead to the production of inaccurate maps.
- The criteria used can often be defined in a rather subjective manner