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ver the next few decades, two emerging technologies-microfabrication and cellular engineering-will make it possible to assemble systems incorporating myriads of informationprocessing units at almost no cost, provided all units need not work correctly and that there is no need to manufacture precise geometrical arrangements among them. The shift to this technology will precipitate fundamental changes in methods for constructing and programming computers, and in our view computation itself.
Abelson et al. (Mon,) studied this question.