Change from what to what?
Or just a change?
A1 contains the word "hoohah"
In A2 enter =IF(A1="hoohah","T","A")
Or did you have something more generic in mind?
On any change at all you would need event code to update A2 rather than
having a fixed formula as above.
Post back if that's the case.
BTW..............Excel syntax for cell references is Column/Row
A1, A2, B1 etc.
Get used to using that syntax rather than Cell_1 or Cell_2
Gord Dibben MS Excel MVP