UDC as it could be made
B. K. Sen · Annals of Library and Information Studies · 2007
It has been observed that during the last half a century, UDC has become more comprehensive on the one hand and more complex on the other; more class numbers have been vacated than filled up; verbal expressions (verbexes) of class numbers in large number of cases are riddled with superfluous words, sentence-like expressions, out-of-date headings, unnecessary clusters. inappropriate, confusing and misplaced headings. As a result many of them are not index-friendly, not even index-worthy. Suggestions have been put forth to ensure more simple class numbers, relocate some classes to more logical positions, reduction in the length of many class numbers, and index-friendly subject headings.