• Top down implies level of detail that is, looking at the highest level of summarization and then decomposing hierarchically to lower levels of deta… - John Zachman

[In Mr. Zachman's view] the architect's drawings [represent] a transcription of the owner's perceptual requirements.

Soon, the enterprise of the information age will find itself immobilized if it does not have the ability to tap the information resources within and without its boundaries.

(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.