“…The paper describes approach based on functional-dependability models understood as a concept of specifying dependability aspect for two perspectives: secure and dependable system as much as service-related operational system. In our research, we focus on two types of service models, that where close to our interest area: Discrete Transport System (DTS) [13,14,15,16,17] and Computer Information System (CIS) [8,10,11,12]. Both systems can be analysed separately, but because of their specific goal, some common mechanisms can be seen.…”