This paper deals with Multi Criteria Decision Analysis in an engineering area (info-communication
networks) by combining two effective mathematical modelling tools: Analytic Hierarchy
Process and Bayesian Network. An extension of Bayesian Network is introduced, this
Vector Bayesian Network is able to calculate the effects of the node faults in info-communication
networks on different errors occurred at end users. We have developed a method combining
expert knowledge and probabilistic theory to analyse fault spreading problem. A numerical
example of network problem is worked out in order to certify our theoretical conception.