In my opinion Zachman Framework is one of the most comprehensive classification methods for enterprise architecture. This framework was first designed introduced by John Zachman in 80s while working for IBM.
Using this methodology has helped me in tackling requirements/design for large scale implementations.
The Core
The base questions which need to be answer in this framework are: Why, What, Where, Who, How and When. These questions have to be answered by different groups: Planner, Owner, Designer, Builder, Programmer and User.
The intersection of these two sets creates a matrix of design artifacts and documents and application.
I highly recommend reading more about this framework and using it.
Some Papers
Zachman Poster
The Zachman Framework For Enterprise Architecture
Top Four EA Methodologies
Books:
Enterprise Architecture Using the Zachman Framework (MIS)
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