The process of classification, in an enumerative scheme, achieved first by consulting the index and then by proceeding location pinpointed in the schedules. Although the index lists subjects rather than concepts one should never classify the index alone as this can lead to error. The relevant schedules examined in order to find the correct number. To take an example, if a book which deals with the work of famous such as Shakespeare, Dinkar and Nehru were to be classified, an index entry for ‘Literature’ might be referred to and the class obtained. However, after proceeding to in the schedules, it apparent immediately that ‘Literature’ is divided by language the question whether all the authors dealt with are English authors must then be classified. Thus the structure classification scheme itself acts are as classifying.
If the classification of machine bolts were copied in a hierarchical scheme, dividing first by material, then by thread shape and head shape and finally by finish, it would begin to the following, appearance: brass bolts stainless steel machine bolts steel.