Patrons changing personal information vs. regional coding information

["Carter, Michelle M " <LRC135 at CLCILLINOIS dot EDU>]

Dear III listserve, 

I would like to turn on the feature where patrons can change their
personal information.  Our circulation manager is agreeing to this on 2
counts:

1)  Patrons will only be able to change their name, address and phone
options; and,

2) How will  the geographic place codes be updated?

Are there any Circulation gurus out there that can share with me what
their library does if they allow patron self-updating?

Much thanks, Michelle