DeKalb, Ill. — Faculty and staff members at Northern Illinois University will return to work on Tuesday to receive several days of training on how to help students in the aftermath of Thursday’s shooting spree, which left five students dead. Students will return to the campus a week later, on February 25.

A memorial service for the students who died will be held on the DeKalb, Ill., campus on Sunday, February 24, the university’s president, John G. Peters, said in an e-mail message sent on Saturday afternoon to students and members of the faculty and staff.

An extra week of classes will be added to the end of the spring semester to make up for the lost time, pushing back the university’s commencement from May 10 to May 17, Mr. Peters said.

The building where the shootings occurred, Cole Hall, will remain closed for the rest of the academic year.

The campus of 25,000 students was thrust into turmoil late Thursday, when a former student burst into a crowded lecture hall and shot 22 students, five of whom died, before turning the gun on himself. By late Saturday afternoon, police had removed the yellow tape that had surrounded the lecture hall, and clusters of onlookers stood nearby, looking quietly at the brick building. Dozens more roamed the snow-covered campus, visiting memorials to the dead.

Mr. Peters emphasized that the healing process would take many forms, one of which was “the return to teaching and learning.” He acknowledged that the normally quiet, unassuming university tucked amid the cornfields 65 miles west of Chicago had become the focus of worldwide attention in recent days.

But, he said, despite the “roller coaster of emotions” that is likely in coming weeks and months, he urged students and faculty members not to be overwhelmed: “Let us continue to show the world that a single act of violence does not define us.” —Libby Sander