1 Subject Indexing :- M.E. Sears
2 Automated Indexing :- H. Ohlman
3 SLIC Indexing :- J.R. Sharpa
4 Zator System :- Calvin Mooers
5 Selecto System :- Cordannir
6 NEPHIS :-Timothy C. Craven
7 Thesaurus Indexing :- P.M. Rogget 1852
8 Systematic indexing :- Kaiser, J. 1911
9 Chain Indexing :- Dr. S.R.Rangnathan 1934
10 Relation Analysis :- Farradabce 1950
11 Uniterm Indexing :- M. Taube 1953
12 Key Word Indexing :- H.P. Luhn 1959
13 Citation Indexing :- E. Garfield 1963
14 BTI Indexing :- Coates 1963
15 PREserved Context Indexing System (PRESIS) :- Derik Austin 1974
16 Postulate Based Permuted Subject Indexing (POPSI) :- G. Bhattacharya 1979
