Understand The Open Group Architecture Framework (TOGAF) and IT architecture in today's world
An Architect's role in today's software world is very vague, this paper by Nicholas Chase gives a pretty good idea on the need for architects but the main focus of the paper is TOGAF and it's different parts like Architecture Development Method (ADM), Enterprise Continuum, etc.
It gives you a clear view of Business Architecture and Enterprise Architecture.
P.S: It also contains contributions from David Jackson and Andras Szakal.
Cheers!