Scientific paper ID 1397 : 2016/3

Mankind activity is accompanied with expansion of range of the so-called “Risk systems”. These are systems for management of technological processes, which on certain conditions, can cause dramatic material and moral damages. The assessment of risk for such violations becomes a vital part of development and investment activity. In the proposed excerpt a thorough analysis of the fault tree as a dependability model is performed. Classifications are made, advantages and disadvantages of every kind of tree and the application areas are indicated. The known (static) fault tree cannot model the dependability behavior of systems in which the consistency of origins of failures is crucial. The so-called Dynamic fault tree is presented, which models processes in time. It also gives an account of the sequence of origination of failures, which makes it appropriate for every system.