I am trying to build a model that iterates through the unique values of a field, then selects each of those values and calculates another field for that selection. I'm having trouble passing the Value output from the iteration to the Select Layer by attribute tool. For example each iteration would output a unique number, lets say 2104, then the Select Layer by Attribute tool would use 2104 as the selection criteria. The model would iterate through all of the unique values calculating the field for each selected set. I can't figure out how to get the Select Layer by attribute to use the output Value of the iteration. Any help would be appreciated. I am very new to model builder.