Often you will have different departments vying for control over the front page which is of course where search engines start. One of the biggest issues is Conical links. How to handle links back to the site or to the same item in the site.
I spend a large amount of time trying to figure out "Best Practices" for these sorts of problems for my clients and use my Blog to capture the best ideas I come across.
None of this is new to us but often it is nice to read it in a concise simple article with all the considerations in a few pages...
I think this article:
SEO Techniques for Large Sites
by Adam Audette
Read At:
http://www.clickz.com/clickz/column/2133151/seo-techniques-sites
Offers one of the better overviews of how to go about developing a schema plan for your site.
Remember that there is also a new consortium of search companies using schema.org layout parameters when instituting these new idea.