Dependability of services networks

In the tutorial paper systems and networks are considered as a union of all their resources essential for the realization of predicted tasks. System dependability is discussed with respect to the occurrence of incidents and treats that may cause damage to the system resources and, in consequence, to the executed tasks. The maintenance policy system is based on two main concepts: detection of unfriendly events and system responses to them. It is proposed to analyse the network system from the functional and user point of view, focusing on business service realized by a network system. Services networks are modelled as the Petri net models which may be useful for analyses of dependability parameters and for setting up a maintenance policy of the services net.