This link does not work - could you repost? Many thanks.
Karin (or anyone else!),
Can you perhaps point me to that post, or give some insight as to how you made this happen? I am unable to figure out how to "Add Field" multiple times to a single shapefile, producing an output shapefile with new fields for which I can then use "Calculate Field" to perform a field calculation.
I can get it to work by chaining Add Fields together in Modelbuilder. Can you describe what you have tried and what seems to be going awry? Are you using an Iterator? Also, any chance the shapefile naming conventions are tripping things up?
Also note - Add Field doesn't produce a new shapefile, but adds a field to an existing shapefile. So if you need the original shapefile maintained without the new fields, make a copy of it first.
ArcGIS Help (10.2, 10.2.1, and 10.2.2) - Add Field (Data Managment)