This article is a key part of enabling an Open Methodology Framework. Eventually, it will be protected and changes will be proposed on its corresponding discussion page. For now, anyone can change this article.
Page History shows what has happened previously on an article. All page history is tracked and changes can be rolled back to go to a previous version.
A more detailed description on Page History is available on Wikipedia; this description aligns with the process that is followed for the Open Methodology.