Situational Judgement Tests (SJTs) are considered as a method of assessment, in the same way as simulation exercises such as Group Discussions, In-basket or Analysis Exercises. They measure judgement and decision making in the contexts presented in the test. However, unlike typical simulation exercises, SJTs do not directly measure behaviour. Rather, they assess an individual’s ability to judge the appropriateness of a pre-defined behaviour or action in a specified context. Research shows that, much like behavioural competencies, the ability to make such judgements is not down to one single attribute, but is determined by a combination of cognitive ability, personality, experience and knowledge (summarised in McDaniel, Whetzel, Hartman, Nguyen and Grubb, 2006). These interrelationships are illustrated below (adapted from McDaniel et al, 2006):