Handling the AGGREGATION component
The Automated Zoning Procedure (AZP) of 1976 provided a way of optimising a function by manipulating the aggregation of spatial data
AZP was too early: no digital data, no GIS, and no automated cartography
GIS Revolution of late 1980s removed these constraints
AZP was revived in 1995 and re-named Zone DEsign System (ZDES)