During open enrollment we give them every possible opportunity. We send emails. We send reminder emails. We send, "Hey, you had an FSA last year and you haven't signed up for one this year - is that on purpose?" emails. We send, "You've never had a dependent care FSA before and you elected one this year - did you mean to?" emails. We send OE is closing emails.
Then we send written confirmations of what was elected with a HOT PINK notice attached to it that says, "These are your open enrollment elections. If they are not what you intended to elect, contact the Benefits office by (usually about 12-18 or so) and we will make the corrections".
We also have on our intranet an "Open Enrollment Extension Form". Anyone can make any changes to their OE elections any time up to 11:59 pm on December 31, using that form. The entire university is closed between noon on 12-24 and January 1, but when we come in on January 2 if it is in someone's email, on the fax machine with a time stamp still in the old year, or has a postmark showing that it was mailed on or before December 31, we'll still take it.
But after that, all bets are off. If the time stamp or postmark is in the New Year, they'd better have been in a coma since November. Preferably in a hospital in Zimbabwe that has no internet connection.
And we'll STILL have people coming in, in June and July, wanting to know if it's too late to elect dental or sign up for an FSA.