I want to point out that it’s disappointingly rare for UX studies to assess the quality of the work produced with the tool that’s being studied. Output is, after all, the goal of much computer use, and the quality of this output is an essential element in judging the user interface.

Investigating the Connection between Usability and Learning Outcomes inOnline Learning Environments 

To really validate these findings we’d need to flip the exercise on it’s head, and see if people know where to find things when presented with just our group names. For this we’d use what’s known as a ‘Tree test’. In this test, all the collections would be subdivided into our groups. These groups would then be presented with only their names visible to the test participants. Participants would then be asked where they would look for a specific collection. The groups we went with for the test are shown below.

Ideally, you should be using the smallest possible gadget to do as much as possible before going to the next largest gizmo in line.