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So Professor Shankar has begun inserting links to specific portions of Professor Lewin’s course, and, “since any mistake would affect larger numbers of students listening online,” he says, he thinks harder about every topic he teaches in the classroom.

His intense, animated ruminations — the title of his course is “Death” — have brought fan mail from Mexico, Iraq, Korea and China. Several months ago, he got a response from somebody suffering from a brain injury and who was using the lectures to exercise his mind. “I don’t think anyone knows what this will do to education 15 years from now,” Professor Kagan says. “But even if it does nothing more than that, that’s enough.”

The backers of free courseware acknowledge the benefit of self-enrichment. Still, they say they expect open education not only to expand access to information but also to lead to success in higher education, particularly among low-income students and those who are first in their family to go to college.

Carnegie Mellon’s Open Learning Initiative is working with teams of faculty members, researchers on learning and software engineers to develop e-courses designed to improve the educational experience.

Carnegie Mellon is working with community colleges to build four more courses, with the three-year goal of 25 percent more students passing when the class is bolstered by the online instruction.

The intended user is the beginning college student, whom Dr. Smith describes as “someone with limited prior knowledge in a college subject and with little or no experience in successfully directing his or her own learning.”

. “We now have the technology that enables us to go back to what we all know is the best educational experience: personalized, interactive engagement,” Dr. Smith says.

That won’t happen, and in the terms-of-use section of Open Yale Courses, the university makes that clear. Besides not granting degrees or certificates, open courses do not offer direct access to faculty. They, in other words, are strictly “for those who wish to learn,” as the Web site says. “Its purpose is not to duplicate a Yale education.”

Open courseware is a classic example of disruptive technology, which, loosely defined, is an innovation that comes along one day to change a product or service, often standing an industry on its head. Craigslist did this to newspapers by posting classified ads for free. And the music industry got blindsided when iTunes started unbundling songs from albums and selling them for 99 cents apiece.

Mr. Schonfeld sees still more potential in “unbundling” the four elements of educating: design of a course, delivery of that course, delivery of credit and delivery of a degree. “Traditionally, they’ve all lived in the same institutional setting.” Must all four continue to live together, or can one or more be outsourced?

P2PU’s mission isn’t to develop a model and stick with it. It is to “experiment and iterate,” says Ms. Paharia, the former executive director of Creative Commons. She likes to talk about signals, a concept borrowed from economics. “Having a degree is a signal,” she says. “It’s a signal to employers that you’ve passed a certain bar.” Here’s the radical part: Ms. Paharia doesn’t think degrees are necessary. P2PU is working to come up with alternative signals that indicate to potential employers that an individual is a good thinker and has the skills he or she claims to have — maybe a written report or an online portfolio.

David Wiley, associate professor of instructional psychology and technology at Brigham Young University, is an adviser to P2PU. For the past several years, he has been referring to “the disaggregation of higher education,” the breaking apart of university functions. Dr. Wiley says that models like P2PU address an important component missing from open courseware: human support. That is, when you have a question, whom can you ask? “No one gets all the way through a textbook without a dozen questions,” he says. “Who’s the T.A.? Where’s your study group?” “If you go to M.I.T. OpenCourseWare, there’s no way to find out who else is studying the same material and ask them for help,” he says. At P2PU, a “course organizer” leads the discussion but “you are working together with others, so when you have a question you can ask any of your peers. The core idea of P2PU is putting people together around these open courses.”

Mr. Reshef’s plan is to “take anyone, anyone whatsoever,” as long as they can pass an English orientation course and a course in basic computer skills, and have a high school diploma or equivalent. The nonprofit venture has accepted, and enrolled, 380 of 3,000 applicants, and is trying to raise funds through microphilanthropy — “$80 will send one student to UoPeople for a term” — through social networking.

Mr. Reshef has used $1 million of his own money to start the University of the People, which taps open courses that other universities have put online and relies on student interaction to guide learning; students even grade one another’s papers.