But actually it it's a great system cause you know when many people contribute mistakes can happen and so you can always roll back you can go back as many revisions if you want as you want so there are other things about CMS we can talk about you can look in Wikipedia there's tons of stuff they say but to, to me I think these are the three most important ones, which is sharing, definition of roles, so the user privileges and the third one is the, version control, system. 