The most important part of a Change Management process is simply being able to tell the stakeholders about an upcoming change. Especially in a world where email is often left unread, there is no one “centralized” group or team making changes, and instant messenger is possibly the only real means of communication. Ideally, a Master Station Log (MSL) or Service Status Page is a focal point for communications about planned events and emergent events. Additional policies may define channels used to broadcast those messages to get the attention of the target audience. Whether or not any of that exists, writing that change announcement really is the most critical part.