Hi Joanne,
Here is a FormCalc script that you can add to two checkboxes to change the value of a third:
if ((form1.#subform[0].CheckBox1.rawValue == 1) and (form1.#subform[0].CheckBox2.rawValue == 1)) then
form1.#subform[0].CheckBox3.rawValue = 1;
endif
Be sure to change the names to match your form.
Mike
www.ensemble.com