|[ui-best-practices-working-group] Report progress in the UI of the request or result|
Here is a dedicated thread to a topic that's been mentioned by Stefan a bit earlier: "scoping" the progress report rather than having dialogs.
Rather than an explanation here is a comparison:
The guidelines page doesn't mention a thing about how to report progress, some other page explain how to properly feed a progress monitor, but I don't think there is something recommending where to place progress report.
Could this be considered as an addition to the guidelines?