Each map branch and task card provides the capability to instigate conversation with others around a subject.
This allows quick clarification with colleagues and importantly the message guides them in one click to the exact area you need their opinion on.
The @chat feature is a quick way to engage others in what you are working on.
The comments made are retained within the branch or task card, making it easier to refer back to information at a later date, so avoiding having to trawl through hundreds of emails.