Synopsis Universal Decimal Classification is practised in many special libraries and information centres attached to science and technology institutions in the world. It is a live and versatile scheme. This practical primer will aid the users in making best use of the classification scheme. The presentation is lucid and user friendly. The contents are arranged in a systematic approach to enable the students and professionals of library and information science throughly understand the classification scheme in it's entirety and put the same to practical use in a much better way than earlier. Worked out problems stand out as a major asset of this book and the readers will be immensely benefitted by the practical knowledge provided by the solutions.