This paper describes a simple method for developing a list of core ser
ials in a particular subject field by analysing article citations in e
lectronic indexes. The Simple Index Method overcomes the difficulties
in building a core list for serials in interdisciplinary fields by usi
ng multiple indexes which cover various aspects of the subject. This m
ethod permits the collection development librarian to develop a core l
ist when standard bibliographies or specific indexing and abstracting
tools are lacking and to tailor that list to the needs of the local si
tuation.