“…Specifically, compared to the amount of work done on logging software and algorithmic modelling approaches, relatively less work has been carried out to clarify the important psychological and sociological factors for cyber security and for insider threat. Importantly, much of the psychological data is scant and focuses on correlations between the so-called Big Five personality traits (i.e., extraversion, openness to experience, agreeableness, emotional stability, conscientiousness; John & Srivastava, 1999; see Axelrad, Sticha, Brdiczka, & Shen, 2013, for an example of a Bayesian network model of insider threat using the Big Five traits) or demographic variables (e.g., gender and age; see Chang & Lim, 2014) with insider threat activity. Thus, the focus of this chapter is to articulate the major challenges for understanding insider threat in the context of cyber security, particularly from a personality and person-specific perspective.…”