This chapter reviews the motives behind the promotion, development and application of practice guidelines, defined as ‘systematically developed statements to assist practitioner and patient decisions about appropriate health care for specific clinical circumstances’. It surveys the state of progress and future prospects for telematics applications in this area, and reports the action points recommended by the 1994 AIM Conference. There exists significant evidence that use of guidelines can improve healthcare process and outcome, and that computerised aids assist this effect. they may also enhance the potential uses of guidelines and protocols for audit, resource management and shared care. A standard generic model for computerised representation of guidelines as knowledge bases in a common format has been proposed and may be a key factor in future progress. The development of computerised patient records of adequate scope and quality is generally recognised as an essential condition for computer-aided guideline use. Support for development, dissemination and application of healthcare guidelines and use has emerged, notably through the AIM EPISTOL study, as a feasible and useful application area of medical knowledge-based systems. It is essential that telematics developments in this field are grounded in an understanding of the healthcare practices to which guidelines are being applied, and of the changes in practice which guideline use may entail.