Every-day routine responsibilities of the medical staff can be enormous.The appearance of the new computer -based information technology enormously ease these activities and enable the medical staff to perform their work mow eflciently and eflectively. One possible application of computer technology in paediatric cardiology where examinations can be very expensive is the optimisation of the diagnostic process in the manner to minimise the number of examinations, and to reduce costs and the risk to little patients. In the paper we would like to present the information system which supports the diagnostic process optimisation (DIAPRO) and the approach used to design it.