Beware that SSN is considered "sensitive" data and if your system doesn't actually need it (i.e. for taxpayer identification), you might want to make it an optional field.

Privacy concerns are high in the US and likely to get worse, and many people will refuse to give their SSN.

Dan

>Dear all
>
>I am translating my software to English and also making some
>structural changes to it in order to reach american users
>
>In Brazil our national indenfication document is CPF.
>CPF is a 11 digits string that has a logic and is possible to validate by a function.
>
>I would like to know if SSN is also a logic string, and a function in VFP is available to validade it
>
>Regards
>
>Moises