Definitions
Information retrieval - querying against a set of documents to find a subset of "relevant" documents
Objective terms - external descriptions, not related to content
Nonobjective terms (content terms) - descriptions of the informational content of the document
indexing exhaustivity - degree to which the index covers the document space
term specificity - describes how well a particular term limits search results.
Recall - relevant docs found / relevant docs in collection
Precision - relevant docs found / total docs found