A check box is a single field that can either be checked or unchecked. The PDF Application Builder assumes that setting a checkbox field to the value "Yes" will cause it to be checked whereas setting it to "No" causes it to be unchecked. The PDF Form Author needs to ensure that this convention is adhered to. Whenever the Mapping Engine maps a boolean value to a checkbox field, it is automatically mapped as follows: True maps to "Yes" and false maps to "No".