...actors.
Preparation of this article was supported in part by Northwestern University's School of Education and Social Policy, and by Andersen Consulting through Northwestern's Institute for the Learning Sciences.

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...original.
This work should be considered informal, until it is released, and is used here only as an argument in favor of this scheme as embodying an eminently testable hypothesis. There are important constraints we do not have room to discuss in this context.
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...humans.
While the computer did better in these studies than did the human actor, we prefer to use this simply as a guide to assessing the difficulty of the task rather than for making broad generalizations. See below.
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Clark Elliott
Fri Feb 28 20:34:25 EST 1997