The Interaction Colors indicate the magnitude of the design interaction equation results. The columns are painted in one of 9 colors, dark blue indicating columns with the least stress and red indicating failure, with gradations of colors representing stress levels in between. Columns that fail for reasons other than being over-stressed are also colored red.

The Interaction Colors are only available after a Process > Design All has been run as it is during this process that the interaction equation results are determined. If changes are made to a model that invalidate the results of a column while Interaction Colors are displayed, the column is repainted in a pale yellow to indicate that a design no longer exists for that column.