Identifying Software Metrics Thresholds for Safety Critical System

The quality of software is very important for every kind of software system. Without quality software, there will be more accidents and system failures. As the responsibility of the software increases, the quality becomes more and more important. This is even more crucial for the case of safety critical software, the failure of which can endanger human lives. For system quality analysis, the software metrics can be used. Although software metrics are well-known and widely used, there is still a discussion about identifying their thresholds and usage. Furthermore, there is a lack of information about software metrics thresholds, particularly about thresholds of safety critical software. This puts evaluators of safety critical systems into a position where they neither have any data for comparison, nor do they know suitable methods for evaluation. This article describes evaluation of software metrics of one safety critical system and provides information about measured data and data collection and evaluation method. Finally, the determined thresholds are presented for future comparison.