[Systems assisting decisions in clinical medicine]. 
There are numerous systems and computerized procedures which have been developed and tested as a guide to clinical decisions.  The methods used in the development of these systems can be divided into two large groups: mathematical and logical.  None of these can be considered as better than the other in absolute, but the efficiency of each system depends on that problem is to be described and solved.  The mathematical methods seem more suitable in the description of biological systems and for the selection of groups which have discriminant and sufficiently defined characteristics.  Meanwhile the logical methods are better in the description and the formalization of more complicated clinical problems, characterized by uncertainty and availability of more or less numerous alternatives.  It is foreseen that in the next years the systems for aided decision making will be programmed making use of methods belonging to both categories, and particularly, the expert systems will be planned using both artificial intelligence techniques and mathematical and statistical methods.  The increasing frequency in the use of such systems in clinical practice will cause a reevaluation and a checking of most aspects of medical proceedings, as seen by the new methodologies or the traditional methods whose use could be driven by computer.