Growth of knowledge is a continuous process. Huge amount of literature is added every year, thus giving birth to new concepts. The basic purpose of any classification scheme is to map the existing knowledge. It is really a challenge before the classificationists to revise the scheme from time to time so that new concepts or branches of knowledge can be accommodated in the scheme. Only one scheme i.e. Dewey Decimal Classification emerged unique out of so many classification schemes, the reason is continuous revision and updation. OCLC has adopted a continuous revision policy for the revision of Dewey Decimal Classification. That is why the 23rd edition of DDC is released in May 2011 for USA and in July 2011 for rest of the world. The present paper highlights the different milestones fallen in the journey of DDC from its 1st edition to 23rd edition. The new features of DDC 23 and major changes have also been discussed in the paper.

Keywords: Library Classification; Dewey Decimal Classification; Recent Trends in Classification; Recent Advances in Classification.