AIDA is a novel diabetes-computing program freely available from www.2aida.org on the Web. The software is intended to serve as an educational support tool and can be used by anyone-patient with diabetes, relative of patient, health-care professional, or student-who has a minimal knowledge of the pathophysiology of diabetes. However, to obtain maximum benefit from the program, a teacher or demonstrator may be helpful. How much (or little) experience should the potential teacher have prior to giving formal lessons with the program? There is no hard or fast "rigid" answer to this. However, one of the aims of this article is to try and encourage people to consider these issues. In this respect it is important to make clear that health-carers cannot just download the program and start teaching with it the next day (or week) if they want their patients to get the most out of lessons with the program. As with many teaching interventions, the rewards of education-"what one gets out of it"-are in part dependent on the effort that one is willing to put in. Therefore teachers have to invest some time and effort into finding out how they can best work with the program to teach their patients in their particular local hospital/clinic setting. A further purpose of this article, and the one that follows in a future issue, is to generate some guidelines and provide some minimum recommendations for small group teaching sessions using AIDA. Previous experience of the authors has revealed a number of ways to improve the outcome of lessons that make use of the software. Among the most important points seem to be the preparation of the teacher, consideration of how to impart preliminary information to help patients understand the pathophysiology of diabetes, the optimum selection of topics to be covered, the arrangement of the lessons, how to involve each of the participants, and how to deal with questions. Other important topics include how to spot and deal with some of the difficulties that may be encountered by participants who apparently seem disinterested, obtaining feedback from the lessons, and practical ideas on how to lead a class.