11. Precision and recall have been two of the traditional performance measures for evaluating information retrieval systems . 12. In short, information retrieval systems are expected to operate in the way that good libraries do. 13. Automated information retrieval systems are used to reduce what has been called " information overload ". 14. In 1985, the library system begins using a computerized cataloging system and a computer-assisted information retrieval system . 15. A "'search engine "'is an information retrieval system designed to help find information stored on a computer system. 16. In fact, when used within information retrieval systems , stemming improves query precision, or true negative rate, for such systems. 17. Based on the author, information retrieval systems are system that helps people to find information from a large database. 18. But Everett Brenner, an expert in information retrieval systems , is not convinced that such a system is the best answer. 19. Taxonomic sequences are essentially heuristic devices that help in arrangements of linear systems such as books and information retrieval systems . 20. In 1997, he created HZ . COM, an electronic mail information retrieval system for two-way pagers and early cellular phones.
