ඩීවී දශම වර් ගීකරණයෙහි 21, 22 හා 23 වන සංස්කරණ පිළිබඳ තුලනාත්මක අධ්‍යයනයක්   A Comparative Study of the 21st, 22nd, and 23rd Editions of the Dewey Decimal Classification

Studying the history of library classification makes it clear that attempts have been made to classify the knowledge in the universe in some way for various reasons. A library classification is a formal method or system provided based on a numbering system so that readers of a library can easily and efficiently reach the library materials or knowledge materials they need through access to the classification number. Accordingly, several major library classification systems have emerged so far. Dewey Decimal Classification (DDC) System can be introduced as an excellent classification system among those classification systems. From time to time, several editions of the DDC appeared for different purposes. Meanwhile, its 23^rd edition can be identified as the most widely used latest edition. This article provides a brief study of the changes and new trends between the 21^st, 22^nd, and 23^rd editions of the DDC System.