Methods and software for estimation of information system dependability

Information system dependability reflects the user´s degree of confidence in the system. Today´s ICT allows connections between information systems in different applications and in different geographic locations. These information systems are called dependable because connections between them cause certain events in one information system to be reflected in the other. Therefore, it is important to have a method for the estimation of information system dependability that will be used in the information system development phase. This estimation will provide arguments for a possible modification of information systems before their final commissioning. The purpose of this paper is to provide an overview of the methods and software for the estimation of information system dependability. Five qualitative and two quantitative methods for estimation of information system dependability are presented. A list of ten estimation software it has been made and five of them are presented in detail.