Q:

What is the purpose of the "change-control" tag? 

I have noticed there are some questions tagged change-control, but I don't understand what the purpose of the tag would be. 
May anybody enlighten me?  What should the wiki page of that tag report? 

A:

Change control is managing the whole process of deploying changes: in a Drupal context, it's mostly related to the Development → Staging → Production → Development cycle problem.