if you're talking about users skipping over questions in a form, and eventually getting the data to a table, then it's using the NULL. you can put 0's in the form controls upon saving the record, or exiting the form...whichever comes first. if you want to replace these things in the table itself, I recommend opening the table in datasheet view, pushing Ctrl+F on your keypad, and typing in NULL where it says "find", and then "0" where it says "replace". then hit REPLACE ALL.