The scale, complexity and short time-scale of the Brucellosis Eradication Scheme made the development of a comprehensive information system imperative. The Brucellosis Information System is derived from three data bases, a computerised record of test results obtained in the Central Brucellosis Laboratory and manually maintained records of problem-herd investigations and within-herd records of routine testing. Reports derived from manual records are presented in a standardised format. The computer record consists of codes representing the type of test performed, the date of test, the number of animals tested and the number of reactors.