See attached.
First I named the Projects Summary sheet, column C:L as Projects mostly because when using conditional formatting, you can't refer to a range on another sheet directly, but can if you name the range....
So formula in E8 of Project Scheduling sheet is:
copied down and across the table.
Then select the E8 to P510 (or whatever the bottom is) and go to Home|Conditional Formatting|New Rule.
Select use a formula to determine which cells to format and enter formula:
click Format and choose green from the Fill tab.
Click OK... then click New Rule and repeat with formula:
and pick Red.
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