According to S.R. Ranganatan "Wherever telescoping of array is done, the canon of Hierarchy is violated. This violation is deliberately done to satisfy

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1.    Law of parsimony : "Between two or more possible alternative rules bearing on a particular phenomenon, the one leading to overall economy of manpower, materials, money and time considered together with proper weightage is to be preferred." This principle though brought in vogue by Ranganathan, it is in practice in many disciplines and suggested by various catalogue codes over a period of time. For example, the distinction made in RDC between 'full' and 'short' style in catalogue is a contribution of law of parsimony.
2.    Law of Local Variation : The principle that in any discipline and technique there should be provision for the users of them to secure, for strictly local use, results alternative to those for general use.
Although the term 'local interest' if interpreted literally, means from national to village. But in accordance to this law, geographical area of any size may be taken into consideration, keeping in view the special interests of the users.
Examples :
1.    In colon classification the digit 2 is used for mother country and digit 3 for favoured country. This not only shortens the class number, but gives priority to shelf arrangement to the local collection and favoured collection.
2.    A language in which the majority of the library are written, may be treated as favoured language of the library, in colon classification for such a language, there is no need to write the number of the language. All books which are written in favoured language of the library would be arranged earlier the group of books written in other languages.
3.    Law of Symmetry
4.    Law of Interpretation