Enable your client to make requests easily within Tango. Tag any relevant requests as a "change request" with a single click and respond instantly to let them know you are on it. Tagging a message as a change request increases transparency and lets the client know that the request is outside the original scope.
All messages tagged as a "change request" are also added to the activity log as it represent a key activity in the life of the project, crucial when you are retracing steps if there is ever a disagreement.