Variations and Fugue on a Theme by Handel located. In other words, what gives unity to the variation set ... is not the theme as such, but rather a network of 'family resemblances', to use Wittgenstein's term, between the different variations." There are various opinions about the organization of the "Handel Variations". Hans Meyer, for example, sees the divisions as nos. 1–8 ('strict'), 9–12 ('free'), 13 ('synthesis'), 14–17 ('strict') and 18–25 ('free'), culminating, of course, in the fugue. William Horne emphasizes paired variations: nos. 3 and 4, 5 and 6, 7 and 8, 11 and 12, 13 and 14, 23 and 24. This helps him to group the
International Standard Authority Data Number International Standard Authority Data Number The International Standard Authority Data Number (ISADN) was a registry proposed by the International Federation of Library Associations and Institutions (IFLA) to provide and maintain unique identifiers for entities described in authority data. Having such a unique number would have the benefits of being language-independent and system-independent. Francoise Bourdon was a major proponent of such a standard, proposing a structure for the ISADN and recommending that the number uniquely identify authority records, rather than their subjects. A 1989 article by Delsey described the work on the IFLA Working Group on an International Authority System, spending