The problem, say Dr. Dourmashkin and others in the department, is that a lot of students had trouble doing that. The failure rate for those lecture courses, even those taught by the most mesmerizing teachers, was typically 10 percent to 12 percent. Now, it has dropped to 4 percent.

Another big concern was attendance.

John Belcher, a space physicist who arrived at M.I.T. 38 years ago and was instrumental in introducing the new teaching method nine years ago, was considered an outstanding lecturer. He won M.I.T.’s top teaching award and rave reviews from students. And yet, as each semester progressed, attendance in his introductory physics courses fell to 50 percent, as it did, he said, for nearly all of his colleagues.

“M.I.T. students are very busy,” Professor Belcher said. “They see the lecture as dispensable, that is that they can get it out of a book more efficiently than getting up, getting dressed and going to lecture.”

Image Since physicists began pushing for universities to do a better job of teaching science, M.I.T. has made a big change. Carolina Hsu inspected a device use to demonstrate the physics of a sunset.

After three years, Professor Belcher had had enough. “I had poor attendance, and was failing 10 to 15 percent, and grading the tests and shaking my head in despair about how little was getting across,” he said. “And this is a subject — electromagnetism — that I love.”

The new approach at M.I.T. is known by its acronym, TEAL, for Technology Enhanced Active Learning.

A $10 million donation from the late Alex d’Arbeloff, an M.I.T. alumnus, co-founder of the high-tech company Teradyne, and former M.I.T. corporation chairman, made the switch to TEAL possible. The two state-of-the-art TEAL classrooms alone cost $2.5 million, Professor Belcher said.

Unlike in the lectures, attendance counts toward the final grade, and attendance is up to about 80 percent.