DEVELOPING BUSSINESS AND USER MEASUREMENT OF THE SYSTEM AVAILABILITY

This work presents basic elements of availability measurement methodology in complex technical systems according to business and users aspect. Methodology, which is primarily related to IT1 systems, is applied to and presented as a case study of Information system of Tax administration - DIS 2003. To achieve designed objectives of implemented methodology, it is necessary to provide "common" measurement from two different aspects: technical and business. The measurement result is system availability level as well as clear identification of critical components that influence the IT infrastructure stability and assure service continuity provided by the system.