"I think Currier is more vulnerable because everything is centralized, and people feel more comfortable [than theyshould]," Das said. "The set-up makes us feelsafer than we should."

Monday's incident follows a number ofintrusions into dorms and Houses all overHarvard's campus this year.

Students attributed these safety problems tothe facility with which anyone can enter a dorm orHouse. Students rarely ask for the IDs of thosewho follow them into buildings or ask to be letin.

"As a student you want to be trustworthy ofpeople," Matthews said. "You do not stop to askfor their keycard."

Some said universal keycard access could ensurethat anyone without keycard access to a dorm isnot a Harvard student.

"Universal keycard access is a solution," saidOwen G. Fletcher '00. "I don't know who is astudent and who is not, otherwise anyone who lookslike a student you will let in."

HUPD is still searching for the intruder butinsists that the incident is not related to anyprevious robberies or assaults.

The Currier House masters and senior tutor werenot available to comment for this article