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T' H E L I B R A R Y of the National Security Agency has completed the organizational and experimental work necessary for the creation of a large-scale Uniterm coordinate index. Production is now on a routine basis. Over 70,000 documents have been cataloged. This report is written at this time to make our experience available to other librarians who may be considering the use of this system. We wish we could answer all the questions that have been raised about coordinate indexing in the literature. Many earnest librarians with very considerable professional experience have been deeply troubled by its potential pitfalls. Perhaps we have been very lucky. Perhaps the pitfalls will vanish in any other large-scale test. We do not know. We can report only that our system works. We do not know of any other means to gain such tight control of large masses of documents so economically and rapidly. There have been problems, however; and some of them were formidable. Our version of the Uniterm system of coordinate indexing is certainly not the last word in desirable development. It contains some of the whimsical invention and much of the rough-and-ready crudities of Henry Ford's Model " T " automobile. But, like the Model "T," it runs. As will be apparent in the account that follows, we have had to introduce many adaptations and changes of the system as originally outlined in the literature. Since we were pioneering, matching our wits against the new system day by day has been challenging. We hope that in solving our own problems we have made a contribution to the developing science of documentation. F o r a n y r e a d e r u n f a m i l i a r w i t h t h e U n i t e r m sys tem of c o o r d i n a t e i n d e x i n g , t h e s c h e m e is conce ived as fo l lows : T h e ideas p r e s e n t e d i n t h e t i t l e of a document, plus additional ideas embodied in the text if t h e t i t l e is n o t suff ic ient ly descr ip t ive , a r e b r o k e n u p i n t o s e p a r a t e words , d u b b e d " u n i t e r m s . " T h e d o c u m e n t is ass igned a n a r b i t r a r y n u m b e r . A 5 " x 8 " m a s t e r i n d e x c a r d is p r e p a r e d f o r e a c h Un i t e rm , a n d t h e n u m b e r ass igned t o a d o c u m e n t is r eg i s t e r ed o n a l l of t h e U n i t e r m ca rds t h a t de sc r ibe t h a t d o c u m e n t . T h u s , t h e U n i t e r m c a r d bea r i n g t h e h e a d i n g C A T A L O G wi l l h a v e insc r ibed o n i t t h e d o c u m e n t n u m b e r of every r e p o r t h a v i n g a n y t h i n g of m o m e n t to d o w i t h ca ta logs o r c a t a l o g i n g . A docu m e n t t h a t is a c a t a l o g of s p a r e p a r t s f o r a u t o m o b i l e w i n d s h i e l d w i p e r s wi l l h a v e its n u m b e r r e c o r d e d o n e a c h of t h e fo l l o w i n g cards : C A T A L O G , A U T O M O B I L E , W I N D S H I E L D , W I P E R , P A R T S . T O f i nd th i s d o c u m e n t , t h e a b o v e ca rds a r e comp a r e d . W h e r e v e r t h e i d e n t i c a l n u m b e r a p p e a r s o n t w o o r m o r e cards , t h a t n u m b e r r e p r e s e n t s a d o c u m e n t w h e r e i n t he ideas in te rsec t , i.e., c o o r d i n a t e .

Problems in the Application of Uniterm Coordinate Indexing