HI, this would be very difficult to achieve if you have both fields appearing on the form together since they both will have to be set to be "required". A user can then enter both email address and telephone number. If you only want one or the other, how about a radio button with choice of "Email Address" and "Telephone Number" and perhaps "Both" and when they click on, it will trigger a question event that will unhide the corresponding field for the user to enter. This way, initially, both "Email Address" and "Telephone Number" are hidden. If they click on "Both", then you can unhide both fields. Will this work for you since I don't know any other possible way of handling this type of scenario. -- David