At this point, ArcMap should look (more or less) like this:
Data Preparation
Now we need to populate the VAC_ACRE, DEVD_ACRE, and CONSTRAINED_ACRE fields for the tool to work. The DEV_TYPE field will be populated later during the scenario painting process, so we don't need to worry about that just yet.
- Navigate to ‘Select by Attributes’. Next to Layer enter your first scenario layer, ET_Vision1. Now we want to select all polygons that are Null, Undeveloped or Vacant. Select "EX_LU" in your field list and then click "Get Unique Values" to examine the values in your land use field. In this example, we will enter: "EX_LU" = 'Vacant/Abandoned' . Click OK.
- Now that all the vacant polygons have been selected, we want to calculate their acreage. Open the Attribute Table, click the "Show Selected Records" button, then right-click on the column header for VAC_ACRE, and select Calculate Geometry to populate this field (in Acres).
- Now, click Table Options and choose Switch Selection. Now, all of the selected features should be the developed polygons. Use Calculate Geometry again to populate the DEVD_ACRE field.
It should be noted that either the VAC_ACRE or the DEVD_ACRE field will be populated, not both.
EX. 
In the next tutorial we will populate Constrained Acres in order to take into account lakes, water bodies, or non-buildable land areas.
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