If you had to implement a bunch of permanent redirects (301) you may wonder if Google is respecting them. This is of paramount importance for your SEO rank, as Google is known to penalize content duplicates. When the SEO karma of a page is split due to duplicates, the ranking of all URLs tanks.
You may still be seeing legacy page URLs in Google Webmaster Tools as if no redirect had ever been put in place. These discontinued, legacy URLs seem to keep generating page views at a lower page rank no matter what you do. Unnerving, isn’t it? The question is: how do you find out if there is anything that can or needs to be done?