Our mission of providing author maintained content leads us towards frowning on changing or rewriting the work of others, unlike most other wikis out there. There are a couple of important exceptions however.
"Please feel free to edit constructively!"
The most common is when a page has been posted by the author and completed to the point that they actively request constructive edits. In this case we welcome you to edit their work to correct grammatical mistakes, unclear ideas, and similar issues but we ask that you maintain the original intent of the work. If you believe the original intent of the work is wrong or misguided for some reason, please post the issue to the talk page and refrain from simply changing it yourself.
Occasionally an author will leave us or stop checking back to answer queries or concerns about their work, and in those cases you may attempt to adopt their work as your own in order to edit it more thoroughly or otherwise correct mistakes. There is no well defined process for adoption as yet, but it does require administrator approval. Your best bet is to leave a message on the author's talk page initially. If they still have not responded within a reasonable period (two weeks to a month), please leave a message on the talk page of one of our admins indicating your desire to adopt the page. As long as the community has no objections, the page will likely be transferred to your stewardship, and your name added to the author box as the adopter and current owner.