I am using ArcGis 10.1 and attempting to build a generic model with model Builder. I am trying to run zonal statistics as a table in a model to get values of slope for some polygons (in a shapefile). The polygons are processed in the model to calculate some other data. The updated shapefile feeds directly into the zonal statistics tool. However, when it comes to run the model, it fails at computing Zonal Statistics as there is no Zone Field (no way to select any field either when editting the model or when running the model). Is there anyway of putting the zonal statistics as a table into a generic model or does the Zone Field have to be manually selected?