International Journal of Mathematical, Engineering and Management Sciences

ISSN: 2455-7749

Application of Software Reliability Model for Safety Assessment of E/E/PE Safety-Related Software

Shinji Inoue
Faculty of Informatics, Kansai University, Osaka, Japan.

Takaji Fujiwara
SRATECH Laboratory, Hyogo, Japan.

Shigeru Yamada
Graduate School of Engineering, Tottori University, Tottori, Japan.


Received on March 09, 2021
Accepted on May 15, 2021


Quantitative and analytical safety assessment methods of E/E/PE safety-related software systems based on the SIL defined by IEC 61508 have been proposed. IEC 61508 does not provide us with quantitative and analytical methods for safety assessment of the software. Our methods give us quantitative information on safety measures for deciding the safety integrity level and testing time duration for achieving certain safety integrity level of E/E/PE software, respectively. Our stochastic modeling approaches are based on software reliability modeling and software reliability assessment techniques. Numerical examples for our methods have been shown for explaining how to use our software safety assessment approaches conforming IEC 61508.

Keywords- IEC 61508, PFD, PFH, E/E/PE systems, SIL, Software safety assessment, Software reliability model.


Inoue, S., Fujiwara, T., & Yamada, S. (2021). Application of Software Reliability Model for Safety Assessment of E/E/PE Safety-Related Software. International Journal of Mathematical, Engineering and Management Sciences, 6(4), 1044-1054.

Conflict of Interest

The authors confirm that there is no conflict of interest to declare for this publication.


The authors would like to thank the editor and anonymous reviewers for their comments that help improve the quality of this work. This research was partially supported by the JSPS KAKENHI (C), Grant No. 19K04144.


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