WordPress Plugin Repository has a new WordPress plugin called Changes. It checks your WordPress blog postsagainst the original content and provides you the percentage of changes made.
It checks how much your edits has changed the content from original and hence you can control your blog’s contributors work in a quick and easy way. Install and activate the Changes plugin. After activation you may visit Dashboard -> Settings -> Changes for entering a list of common used words separated with a comma or simply leave it blank to load default list.
Now Visit your Dashboard -> All Posts and open any post for editing. You will be seeing a new meta box ‘Changes’ is added that allows you to view the percentage of changes made by clicking ‘Click to view changes’ button.