
Then you need:
- Specify criterion name;
- Specify attribute that you want use as a source for performance table data;
- Choose a function for aggregate data for alternative (data would be aggregated only if you work with "complex" alternatives which consists of several polygons).
All GIS actions over alternatives synchonized with MCDA actions. So if you delete alternative from GIS sybsustem it also disappear from MCDA sybsustem. If you choose another site (polygons) for alternative performance table data for map-attribute criteria will be automatically updated.