The work presents a certain concept of an advisory system, which assists in making decisions in the technical diagnostic tasks. To this end, as a mathematical formalizm, the Group Method of Data Handling (GMDH), from the class of genetic algorithms has been adopted. ; The rules of the knowledge base creation and the stages of the algorithm GMDH realization have been discussed and commented. Following this theoretical basis, the assumption of the computer-aided diagnostic of technical objects system has been formulated. The work has been completed with an example illustrating advantages and disadvantages of the solution proposed.