"They were unsure as to whether Harvard was in or out," the source said.
But with or without Harvard, the source said he expected the alliance could be implemented as early as July 1 of this year, but possibly in the fall.
Yale University is already planning to offer some courses to alumni over the Internet, according to the Yale Daily News.
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Yale officials had no comment on the ongoing discussions about the proposed alliance.
Officials from Princeton and Stanford Universities did not return calls for comment yesterday afternoon and evening.