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Fig. 11.11. Boxplots for the quality aspects of the prototype: ratings given at the
end of the interview (boxplots on the left) and after longer-term use (boxplots on
the right)
and wrong playlists) and the relatively small size of the music collection
(approximately half a million tracks, most of which were from unknown
artists). 47% felt that the music collection did not meet their needs, and
30% mentioned that they did not want to use the prototype, especially for
this reason. The lack of features also had an effect on the grades for “I was
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