In the morning of November 29th 2013, launching ceremony and inauguration of the training workshop on "Dewey Decimal Classification - Vietnamese Edition 23" (DDC23) has been held at the National Library of Viet Nam. This is one of three important international tools for information access and exchange in library – information activities being used by over 200,000 libraries in 138 countries. Translation and printing of the Dewey Decimal Classification - Vietnamese Edition 23 are done deriving from practical benefits of cataloguing, contributing to unification, standardization, information exchange and international integration of Vietnamese libraries, and at the same time basing on the demand for application of DDC in Vietnamese libraries. After the launching ceremony of the Vietnamese DDC23, the National Library of Viet Nam has held a ToT training workshop for the Dewey Decimal Classification - Vietnamese Edition 23 for representatives of some libraries, information centers, special libraries and library training institutions in Viet Nam. The training workshop is lectured by Dr. Julianne Beall, Assistant Editor of the Dewey Decimal Classification and lasts from November 29th until December 6th 2013. In the year 2014, the NLV will organize further training courses for using the Vietnamese DDC23 for all libraries and information centers nation wide.