Intrusion detection system (IDS) has become an essential component of computer security in the organization. IDS can provide multiple benefits for the effective information security, at the same the evaluation of IDS must be concerned for the management. The overall objective of decision-making as regards information security products (for instance IDS) is to select the most effective as well as the most cost-efficient among the competitive ID systems. The paper introduces the evaluation model of existing IDS. The main attributes of competing ID systems (NIDS and HIDS) performance are analysed in a multi- criteria hierarchy with the inclusion of the main types of decision-makers and their objective as determinant factors.