i think we'd have to see a sample of your workbook / data / formulas you're using to generate the cumulative cost curve to help you with this... apparently your underlying data in the cumulative cost column does occasionally go down...
also, what do you mean based on % completion?
Hope I could help - if your post has been solved don't forget to mark it as such.
Clicking the * below is a great way to say thanks!
"Drowning in 10 feet of water isn?t any different than drowning in a million feet. And if you can swim, it doesn?t matter how deep the ocean is. At some level, once you realize you?re in water that?s too deep to stand, you have to have a very different approach," - Joi Ito
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