Putting your SSN on everything is dangerous. Just because someone in your school has not been caught at identity theft (yet) does not mean it cannot happen. Criminals even search through people's garbage to find SSNs, so they could easily find them at colleges that do this. I've had professors that required stupid things like this and even back then I was uncomfotable with it, but now that identity theft is a real problem I would have nothing to do with this. One of my professors even gave the entire class a list of everyone's SSNs. It is irresponsible for colleges to encourage or even require such reckless disregard for personal security. It is worse than leaving your door unlocked.