Hi Dave,
I suspect a proper response to this may end up being a couple of blog posts in length. Lets start with a couple of references:
Comprehensive Functional Verification by Bruce Wile, John Goss, and Wolfgang Roesner covers test plans. I have not read the whole book. It is on my some day maybe list.
Peet James Snug 2000 paper on Verification plans
https://www.rose-hulman.edu/class/ee/doering/From_Novell/EC533/qualis/verifplan.pdf
Verification Plans by Peet James. More words than the Snug paper. I was not fond of his writing style in the book though. I liked the paper better.
