It appears that there are several definitions of critical thinking of equally valuable meaning (Moore, 2013). There is agreement across much of the field that meta-cognitive skills, such as self-evaluation, are essential to a well-rounded process of critical thinking (Glaser, 1984; Kuhn, 1999; Pithers and Soden, 2000).There are key themes such as ‘critical thinking: as judgement, as scepticism, as originality, as sensitive reading, or as rationality’ which can be identified across the literature. In the context of developing an individual’s critical thinking it is important that these themes take the form of observable behaviours