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  Human beings are limited in their capacities to learn, think, 
 and act. Luckily complex artifacts -- like computers -- do
 not have to be the product of one person's hands or mind. 
 If an artifact can be divided into separate parts, and the
 parts worked on by different people, the "one person"
 limitation on complexity disappears. But this implies that
 techniques for dividing effort and knowledge are fundamental
 to the creation of highly complex manmade things.
 
  The word “complex” in this context has the following
 commonsense meanings:
 
 [... 省略 ...]
 
  These definitions clearly contemplate a spectrum ranging
 from the starkly simple to unimaginably intricate. If we
 think of arraying artifacts along this spectrum, two
 interesting points arise as we move from simple to complex:
 (1) the point at which an artifact can no longer be made by
 a simple person; and (2) the point at which an artifact can
 no longer be comprehended by a single person. Crossing into
 the first region requires a division of labor; crossing into
 the second requires a division of the knowledge and effort
 that go into creating a design.

[[Design Rules]], p.5