The theory of information discernment discussed here is firmly based on models, research and scholarship of information literacy coupled with theory and research in information behaviour. This paper will explore original research conducted by Walton and Hepworth and how it has developed over the last 10 years - the pilot study was reported in the very first edition of this journal in 2007. It will show that it has led to the emergence of the concept of information discernment and how Foucault’s discourse analysis theory has been used to further critically analyse its application. This paper will show how the research has been applied in a range of contexts, from enabling students in their first year of A-level study in the UK to carry out b...