It is only the advent of an automated model storage facility or repository that brings any of this into the realm of feasibility and makes architectu… - John Zachman

With increasing size and complexity of the implementations of information systems, it is necessary to use some logical construct (or architecture) for defining and controlling the interfaces and the integration of all of the components of the system.

The analytical approach employed by both BSP and BISC is "top down". The implications of the words "top down" are multiple and varied, and all apply to these analysis. For instance:

The world contains entities, processes, locations, people, times, and purposes. Computer systems are filled with bits, bytes, numbers, and the programs that manipulate them. If the computer is to do anything useful, the concrete things in the world must be related to the abstract bits in the computer. Zachman’s framework for information systems architecture (ISA) makes that link. It provides a systematic taxonomy of concepts for relating things in the world to the representations in the computer.