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\label{sec:test-results}

All unit tests successfully passed. Integration testing was
successful.

Usability testing identified several problems with the frobber
menu. The users indicated that they preferred click-and-drag behavior
for the frobbers (e.g. move and resize), rather than the modal
click-source then click-destination behavior. Also, they preferred the
rotation frobber action to be relative to the initial position
of the gizmo, not absolute. These changes were made in response to the
user input.