Hi Nancy,

In the valid of the School Checkbox:

IF This.Value = .T.
    ThisForm.chkSchool.Value = .F.
ENDIF

In the valid of the Work Checkbox:

IF This.Value = .T.
    ThisForm.chkWork.Value = .F.
ENDIF

Hope this helps,
Gavin...

>I have two logical fields - SCHOOL and WORK. I want to simply prevent users for checking of both SCHOOL and WORK - only one can be checked off. I have tried several things with the WHEN event of the check boxes such as in the WHEN event of the SCHOOL field I put in "work = .f.". However this doesn't work and I am still able to check off both boxes.
>
>Thanks,
>
>Nancy