Although I do not find much value in the modeling of negative float it is frequently a requirement on our schedule specifications. Therefore I am looking for the best way to do so.
At the moment I am using a comparison schedule similar to current schedule but set up with all activities ALAP and a schedule run similar to the current schedule [regular/leveled] but backward computation. The Negative Float value equals the comparison difference field DIFFERENCE-Start. I am using bar colors defined with a signal so most critical are red, those with negative float but less critical in yellow and green for activities with float.
I am trying to polish my procedure so I am asking for suggestions.
• Is my procedure correct?
• Is there an easier way?
• One of the issues I am having is on setting up the color signal based on the value of DIFFERENCE-Start field so that red is always only minimum value, yellow for values greater than minimum up to 0, and green for values greater than 0. For simplicity any suggestion that do not require use of formulas and scripts will be welcomed.
• Another issue I am having is with the label of comparison fields, I am not being able to change them.
The following figure displays the logic I am using. I am showing Early and Late Bars for current schedule as well as Negative Float Bars from compared schedule. Also I should be able to display Separate S curves for all bars, something important to me as the substitution of current schedule late bars with the negative float bars yields non-matching sets of S-Curves that are misleading.
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Best Regards,
Rafael