What is mean by APUPA pattern or arrangement?
Dr S.R.Ranganathan who is our father of Library and information science in India has enunciated a fundamental principle is known as APUPA pattern. APUPA pattern is one of the methods of arrangement of books in Classification. As per this method documents are classified in three types viz, Umbral, Penumbral and Alien. Umbral document implies the totally relevant document which is main interest of the reader. Penumbral document satisfies the marginal interest of the reader. This type is partially relevant and someway related to Umbral document. Alien document is totally non- relevant and thus is not required by the reader. So, we can recognize the pattern of every helpful sequence of book is Alien- Penumbral- Umbral- Penumbral- Alien - i.e. APUPA arrangement.
Thus the APUPA pattern arranges the most relevant book at the centre, books of marginal relevance on both side of the relevant book and totally disconnected books far away from the centre. This is the best way to maintain filiatory sequence. The filiatory sequence implies the placement of all the entities of a universe of knowledge in a definite sequence in one line according to the degree of their mutual affinities. The helpful sequence therefore, is said to be the one which follows the APUPA pattern.
Excellent explanation with diagram
Thank you Janab Parvez Ahmad Saabb!
It seems that after a couple of decades, I saw an explanation with a diagram. It brought back my memory of the old by gone days. Such diagrams like those of "Recall Value" & "Relevance" for database searching were quite popular in our days!
I am looking forward to see how the New-Gen LIS Professionals react to such explanatory posts!
Siddhartha S. Ray, Calcutta
Known as the "father of library and information science," Dr. S. R. Ranganathan created the APUPA pattern as a method of classifying books and documents based on their relevance to the searcher.
The APUPA pattern--which stands for Alien-Penumbral-Umbral-Penumbral-Alien--is used in the field of library and information science as a method of book or document classification.
Problems with the APUPA pattern arise when books or documents have more than one subject, as is the case in multidisciplinary studies.
It is difficult to maintain in a library where there are different categories of users. Say, there are two categories of users in an academic library - students and research scholar. The APUPA pattern may not be the same for these category of users.