Dr.-Ing.

Jedlitschka, Andreas

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  • Publication
    Empirical practice in software engineering
    ( 2013)
    Jedlitschka, Andreas
    ;
    Guzman, Liliana
    ;
    Jung, Jessica
    ;
    Lampasona, Constanza
    ;
    Steinbach, Silke
    Experimental software engineering has been defined as the scientific approach to systematically evaluating software technologies by referring to predefined hypotheses using sound empirical methods. The purpose of this chapter is to give an overview of the history, current practice, and future of empirical practice in Software Engineering. In particular, based on what we have learned from 20 years of research in empirical software engineering, we describe the empirical approach we are currently using in terms of a scientific approach to applied research and as a means for systematic evaluation.
  • Publication
    A controlled experiment on component fault trees
    ( 2013)
    Jung, Jessica
    ;
    Jedlitschka, Andreas
    ;
    Höfig, Kai
    ;
    Domis, Dominik
    ;
    Hiller, Martin
    In safety analysis for safety-critical embedded systems, methods such as FMEA and fault trees (FT) are strongly established in practice. However, the current shift towards model-based development has resulted in various new safety analysis methods, such as Component Integrated Fault Trees (CFT). Industry demands to know the benefits of these new methods. To compare CFT to FT, we conducted a controlled experiment in which 18 participants from industry and academia had to apply each method to safety modeling tasks from the avionics domain. Although the analysis of the solutions showed that the use of CFT did not yield a significantly different number of correct or incorrect solutions, the participants subjectively rated the modeling capacities of CFT significantly higher in terms of model consistency, clarity, and maintainability. The results are promising for the potential of CFT as a model-based approach.
  • Publication
    Experimental comparison of two safety analysis methods and its replication
    ( 2013)
    Jung, Jessica
    ;
    Höfig, Kai
    ;
    Domis, Dominik
    ;
    Jedlitschka, Andreas
    ;
    Hiller, Martin
    (Background) Empirical Software Engineering (SE) strives to provide empirical evidence about the pros and cons of SE approaches. This kind of knowledge becomes relevant when the issue is whether to change from a currently employed approach to a new one or not. An informed decision is required and is particularly important in the development of safety-critical systems. For example, for the safety analysis of safety-critical embedded systems, methods such as Failure Mode and Effect Analysis (FMEA) and Fault Tree Analysis (FTA) are used. With the advent of model-based systems and software development, the question arises whether safety engineering methods should also be adopted. New technologies such as Component Integrated Fault Trees (CFT) come into play. Industry demands to know the benefits of these new methods over established ones such as Fault Trees (FT). (Methods) For the purpose of comparing CFT and FT with regard to the capabilities of the safety analysis methods (such as quality of the results) and to the participants' rating of the consistency, clarity, and maintainability of the methods, we designed a comparative study as a controlled experiment using a within-subject design. The experiment was run with seven academic staff members working towards their PhD. The study was replicated with eleven domain experts from industry. (Results) Although the analysis of the tasks' solutions showed that the use of CFT did not yield a significantly different number of correct or incorrect solutions, the participants rated the modeling capacities of CFT higher in terms of model consistency, clarity, and maintainability. (Conclusion) From this first evidence, we conclude that CFT have the potential of being beneficial for companies looking for a safety analysis approach for projects using model-based development.
  • Publication
    A controlled experiment on component fault trees
    ( 2013)
    Jung, Jessica
    ;
    Jedlitschka, Andreas
    ;
    Höfig, Kai
    ;
    Domis, Dominik
    ;
    Hiller, Martin
    In safety analysis for safety-critical embedded systems, methods such as FMEA and fault trees (FT) are strongly established in practice. However, the current shift towards model-based development has resulted in various new safety analysis methods, such as Component Integrated Fault Trees (CFT). Industry demands to know the benefits of these new methods. To compare CFT to FT, we conducted a controlled experiment in which 18 participants from industry and academia had to apply each method to safety modeling tasks from the avionics domain. Although the analysis of the solutions showed that the use of CFT did not yield a significantly different number of correct or incorrect solutions, the participants subjectively rated the modeling capacities of CFT significantly higher in terms of model consistency, clarity, and maintainability. The results are promising for the potential of CFT as a model-based approach.
  • Publication
    Experimental comparison of two safety analysis methods and its replication
    ( 2013)
    Jung, Jessica
    ;
    Höfig, Kai
    ;
    Domis, Dominik
    ;
    Jedlitschka, Andreas
    ;
    Hiller, Martin
    Empirical Software Engineering (SE) strives to provide empirical evidence about the pros and cons of SE approaches. This kind of knowledge becomes relevant when the issue is whether to change from a currently employed approach to a new one or not. An informed decision is required and is particularly important in the development of safety-critical systems. For example, for the safety analysis of safety-critical embedded systems, methods such as Failure Mode and Effect Analysis (FMEA) and Fault Tree Analysis (FTA) are used. With the advent of model-based systems and software development, the question arises whether safety engineering methods should also be adopted. New technologies such as Component Integrated Fault Trees (CFT) come into play. Industry demands to know the benefits of these new methods over established ones such as Fault Trees (FT). (Methods) For the purpose of comparing CFT and FT with regard to the capabilities of the safety analysis methods (such as quality of the results) and to the participants' rating of the consistency, clarity, and maintainability of the methods, we designed a comparative study as a controlled experiment using a within-subject design. The experiment was run with seven academic staff members working towards their PhD. The study was replicated with eleven domain experts from industry. (Results) Although the analysis of the tasks' solutions showed that the use of CFT did not yield a significantly different number of correct or incorrect solutions, the participants rated the modeling capacities of CFT higher in terms of model consistency, clarity, and maintainability. (Conclusion) From this first evidence, we conclude that CFT have the potential of being beneficial for companies looking for a safety analysis approach for projects using model-based development.
  • Publication
    Evaluation summary
    ( 2012)
    Jedlitschka, Andreas
    ;
    Jung, Jessica
    ;
    Lampasona, Constanza
    Decision makers in embedded system development require evidence about technologies to enable them to make an informed decision when new development technologies are to be introduced.