“They just didn’t get it,” he said. “They didn’t understand the importance of our concern.”

Sam Zarifi, the Asia Pacific director for Amnesty International, said while the Chinese government has made some strides in recent years, it has hardened its stance on other issues, such as Tibetan autonomy. “China has moved forward, but not at the pace that we had hoped,” Zarifi said. “Certainly for the I.O.C. to pat itself on the back I think is not really a fair evaluation of all that they accomplished.”

The I.O.C. report also applauded the Games for improving public health in China, saying that authorities “took new steps to improve food and water safety” and quoted a World Health Official, Hans Troedsson, as saying the public-health legacy of the Games is a “long-term gift to China.”

There was no mention of the tainted-milk scandal that broke just after the conclusion of the Games and which has led to the death of four infants and sickened more than 50,000 others. Worden pointed to reports that a Chinese journalist’s blog post about the contaminated milk was removed from a Web site just as the Games were beginning. Chinese reporters were also prohibited from reporting on food-safety issues during the Olympics, she said.

“I think it has to be said that the news was there of the toxic baby formula,” Worden said. “Censorship in China is a matter of life and death.”

Despite the timing of the tainted-milk scandal, the public health improvements brought about by the Games should not be overlooked, said Zhen Xiaozhen, who served as the medical service manager of the Beijing Olympics. She pointed to a ban on smoking in public places and the training of 3,000 medical volunteers. “These health care volunteers are the legacy for the future,” she said.

The meetings in London are part of a debriefing process in which Beijing organizers pass along technical advice to those planning the London Games in 2012. This “knowledge management” process dates to 2000, and was instituted by the I.O.C. president, Jacques Rogge, to improve efficiency and planning of future Olympic Games, said Emmanuelle Moreau, a spokeswoman for the Olympic committee.

“The Beijing debrief focuses on the operational aspects of the Games and does not intend to address issues that fall outside the remit of the I.O.C.,” she said in an e-mail message. Moreau said the questions raised by the human-rights groups will be examined next year at the annual Olympic Congress in Copenhagen.