When to use it
Use it when new requests get added to a project that already has a deadline. Calling it a new request is neutral, not a complaint, and scoping it separately protects the date you already promised. It also gives the new work the attention it deserves.
Example
Client: “Can we also add a dashboard?”
You: “That's a new request. Let's scope it separately so the current work stays on time.”
Client: “Fair. Send me an estimate.”
In an email or Slack message
In email: “Good idea on the dashboard. Since it's outside the current scope, I'll send a separate estimate by Friday so the launch date stays on track.”