Topology--the spatial relationships between geographic features--is fundamental to ensuring data quality. Topology enables advanced spatial analysis and plays a fundamental role in ensuring the quality of a GIS database. In the ArcInfo "coverage" model, hundreds of thousands of GIS users worldwide learned the benefits of topology by performing the build and clean operations on their databases. At ArcGIS 8.3, Esri will introduce a new suite of editing tools necessary to construct and maintain user-defined topological relationships with a geodatabase. In ArcGIS, the validate topology capability will ensure data integrity by validating the features of a geodatabase against a set of topology rules. To learn more about the comprehensive new topology tools in ArcGIS 8.3, please see ArcGIS 8.3 Brings Topology to the Geodatabase.