Case formulation, or case conceptualisation, is regarded as a core competency in many helping professions, including psychology. The origins of case formulation in professional practice can be traced back as far as Hippocrates and Galen in Ancient Greece (Eels, 2012). And yet anecdotally it is interesting that many psychologists find it difficult to express what exactly is case formulation. I remember, much to my embarrassment, being asked by a supervisor when I was half way through my advanced training to provide a case formulation for a client and being unable to articulate same. From hindsight even more interesting was the difficulty my supervisor had in explaining what was required for an appropriate case formulation. Even recently, Ridley, Jeffrey, and Roberson (2017) bewail a state of crisis in case conceptualisation citing inconsistent definition and implementation of this fundamental skill.