The National Information Services Corporation (NISC) provides CD-ROM databases which cover scientific, practical and information disciplines. The subjects range from aquaculture to worldwide wildlife, combining information from a number of different sources and providing it in one easy to access database. NISC have provided a number of features which are specially designed to aid users of these databases and ensure all the relevant articles are found. The database checks variations of the search information, automatically searching for alternative spellings of words (cenozoic, caenozoic or cainozoic), checking for plurals (formula, formulae, formulas) and allowing for compound words (CD-ROM, CD ROM and CDROM). A thesaurus feature on some...