For example, it introduced recall and precision, truncation, synonyms, and weights. One of the nice things about the article is that besides introducing these concepts, it presented these concepts within a framework of recall and precision enhancing devices. Additional observations supplied in group write-up. To make the problem tractable - work with surrogates. Introduces IR concepts and the relationship of IR systems to other information systems.
Conceptual model establishes general approach, rest follows.
Fox mentions unstructured vs. unstructured document types. All information retrieval systems have a database structure such as inverted file structures, flat file structures, signature, pat trees, graphs, and hashing. It allows a user to add, delete and change documents in the database. It also allows user to use query to search and retrieve documents. In the design of IR systems, hardware is very important because it affects the speed as well as determine the amounts and types of information stored in the system.