This Wikibooks chapter was produced as part of the 2018-19 Issues in Interdisciplinarity module on the UCL BASc's Approaches to Knowledge module. It is an example of student-generated work from the course. The full Wikibooks chapter can be found at this location: https://en.wikibooks.org/wiki/Issues_in_Interdisciplinarity_2018-19/Truth_in_the_Diagnosis_of_Depression.