Postulate-Based Permuted Subject Indexing (POPSI) 

Postulate-based Permuted Subject Index (POPS!), designed by Ganesh Bhattacharyya at the Documentation Research and Training Centre (DRTC), Bangalore, is another indigenous indexing model besides Ranganathan's Chain Procedure. It is now about fifteen years since it has been designed and is in the process of further development, particularly in its application. POPSI  can be applied to micro and macro level documents  available in the form of  non-print/non-book forms. As the system is comparatively new, its use in subject files  is rather  limited. What follows is a short summary of POPSI dealing with some of the essential features of it, largely culled out from the writings of Bhattacharyya.