Well-Designed Digital Libraries (WDDLs)

Well-Designed Digital Libraries, based on Subjects Areas: 

Unfortunately, in Music and books on music, and Philosophy, psychology and religion subject areas, there are no WDDLs. Thus, in 13 out of 15 subject areas, 34 out of 62 digital libraries turn out as well-designed digital libraries. 

The Well-Designed Digital Libraries, based on Scores