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 24 When "Open Access' system was introduced in libraries, the systematic subject arrangement was found to be the most convenient one for the readers as well as the staff of the library. Hence a num- ber of book classification systems were evolved by the library scientists. They were published and practised by many libraries. A printed classification for arranging books is called a scheme. The special features of a scheme of book classification are:- 1. Schedules-Headings which comprise the scheme. 2. Generalia class to accommodate works which treat knowledge in general. 3. Form classes which contain books writ- ten in a certain form, viz., encyclo- paedia, essay, poetry, drama, fiction, speeches, etc. 4. Form Divisions-Generalia divisions of each particular subject. 5. Notation System of symbols to repre- sent a subject and its divisions. 6. Index-Alphabetical list of the terms used in the schedules, giving the nota- tion for each term. All the classification schemes attempt to make out a list of all branches of knowledge. Hence they are called enumerative. In an enumerative classi- fication scheme, the sub-classes are made for a more general class deductively. But there are many books which deal with several branches of though not in detail. Hence the Library Scientists knowledge