One Laptop Per Child, an ambitious project to bring computing to the developing world's children, has considerable momentum. Years of work by engineers and scientists have paid off in a pioneering low-cost machine that is light, rugged and surprisingly versatile. The early reviews have been glowing, and mass production is set to start next month.

Orders, however, are slow. "I have to some degree underestimated the difference between shaking the hand of a head of state and having a check written," said Nicholas Negroponte, chairman of the nonprofit project. "And yes, it has been a disappointment."

But Mr. Negroponte, the founding director of the M.I.T. Media Laboratory, views the problem as a temporary one in the long-term pursuit of using technology as a new channel of learning and self-expression for children worldwide.

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