During the new report wizard the user has the option to choose grouping. Example: Giulio grouped on City during the TOI presentation 22 April 2013.
Expected result: report will have one group for each distinct City.
Actual result: report will have repeated instances for cities if the data is not sorted.
This behavior is well understood by experienced users. But it's not clear for new users.
The report wizard needs to guide users to sort so that they get the results they expect.