There is a set of architectural representations produced over the process of building a complex engineering product representing the different perspe… - John Zachman

[Zachman reasons that] an analogous set of architectural representations is likely to be produced in building any complex product.

(Enterprise Architecture is) the set of descriptive representations (i.e., models) that are relevant for describing an Enterprise such that it can be produced to management's requirements (quality) and maintained over the period of its useful life.

To keep the business from disintegrating, the concept of information systems architecture is becoming less of an option and more of a necessity

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.