Three indexes to a collection of 3204 documents in the field of chemistry were test searched. The indexes are a keyword from title index without added keywords, a keyword from title index with added keywords, and a single access point per document alphabetic subject index. The three indexes were searched by 14 graduate chemistry students with 66 questions. Search results are characterized in terms of recall, precision, search time, and three other single figure measures. A measure of index performance based on recall, precision, and search time was developed. There is no statistically significant difference between search results with the multiple access points per document keyword from title index and the single access point per document alphabetic subject index. Statistically significant differences in search results were found between the keyword from title index with added keywords and the keyword from title index without added keywords. The effect of the size of the delete word list and of elements of vocabulary control in keyword from title indexes was also studied. (Author)