Boolean

Boolean searching is the traditional way to search for information in most online services, including the LexisNexis® services. It uses words and connectors to create phrases and concepts based on specific rules of search logic. The computer searches for documents with the specific words and combinations of words in the search request. Each word, or one of its specified alternatives, must appear in each document retrieved.

The term "Boolean" comes from George Boole, a 19th century mathematician. Boole developed a system that described language in mathematical/logical terms. His work formed the basis of many computer-assisted retrieval services.