The Citadel is an archive of information for George R.R. Martin's A Song of Ice and Fire.
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[Did GRRM always mean to write from multiple POVs?]
Yes.
[What are the strengths and weaknesses of this method?]
It is really the only way to tell a large, sprawling, complex story if you are using a third-person, limited viewpoint, as I do.
The Westeros network consists of several different sites, including a forum and a wiki, for all your A Song of Ice and Fire needs.