Model Builder Entering a Field Name in Calculate Field

Discussion created by fastth on Jun 13, 2011
Latest reply on Apr 4, 2013 by DCurtis@nps.gov_nps
I am new to model builder. I have a model which requires the user to enter the field name for  a Calculate Field GP task. My question is how do I set up in Model builder so that when the user starts it it gives him the choice of which Field Name to use for the Calculate Field GP step in the model? Calculate field does not seem to be able to allow the user to enter in a field name.
Here is a screen shot of my model: