Analysis of E-Trans software solution failure sources and modes

Gregor Žnidaršič (2008) Analysis of E-Trans software solution failure sources and modes. EngD thesis.

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Abstract

This paper deals with possible failure modes in software for logistic E-Trans application, which is provided by company E-Soft d.o.o. in Škofja Loka. Because reliability of software is very important today, its development demands additional steps for improvement. At the beginning of this paper I describe the E-Trans application, then I compile a list of failure modes and try to find out reasons for them and at the end I analyze them with two known methods. The first method is called fault tree analysis (FTA) and is founded on designing of a fault tree diagram. Undesired condition of a system is analyzed with Bool logic and is founded in the root of the tree. All the possible causes for this condition are stated as leaves on the tree, which are connected to the logic gate symbols. By this method dependence between causes for system failure is acquired. The second method, which is used in this paper, is failure modes and effects analysis (FMEA) where the risk priority number for every failure mode is calculated. This is how we get a tabulated review of failure modes. A table, sorted decreasingly by risk priority number presents a priority list and shows which failure mode causes the highest danger for system failure.

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