A significant observation regarding... architectural representations is that each is of a different nature than the others. They are not merely a set of representations, each of which is an increasing level of detail than the previous one. Level of detail is an independent variable, varying within each architectural representation.

Zachman (1986) as cited in: Peter Bernus, Kai Mertins, Günter Schmidt (2005) Handbook on Architectures of Information Systems. p. 544