Boolean operators

Boolean operators are used to connect and define the relationship between your search terms in eHRAF. You will find radio buttons for the operators AND, OR, and NOT separating the different sections or clauses in the search form. Always double-check the radio buttons before searching. Selecting the incorrect operator for your search can severely limit or expand your results. Choosing AND will narrow your search because it requires that all of the terms entered are present at the same time in the search results, while OR will expand the results to include matches for any one clause or keyword at a time.