# Model comprehension for security risk assessment: an empirical comparison of tabular vs. graphical representations

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## Abstract

Tabular and graphical representations are used to communicate security risk assessments for IT systems. However, there is no consensus on which type of representation better supports the comprehension of risks (such as the relationships between threats, vulnerabilities and security controls). Cognitive fit theory predicts that spatial relationships should be better captured by graphs. In this paper we report the results of two studies performed in two countries with 69 and 83 participants respectively, in which we assessed the effectiveness of tabular and graphical representations with respect to extraction correct information about security risks. The experimental results show that tabular risk models are more effective than the graphical ones with respect to simple comprehension tasks and in some cases are more effective for complex comprehension tasks. We explain our findings by proposing a simple extension of Vessey’s cognitive fit theory as some linear spatial relationships could be also captured by tabular models.

## Keywords

Empirical study Security risk assessment Risk modeling Comprehensibility Cognitive fit## Notes

### Acknowledgements

This work has been partly supported by the SESAR JU WPE under contract 12-120610-C12 (EMFASE). We would like to thank B. Solhaug and K. Stølen from SINTEF for support in the definition of the CORAS models. L. Allodi helped us to organized the first experiment for the second study in Cosenza.

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