Sly Saint
Senior Member (Voting Rights)
Whilst the starting point for all psychological therapies is the client’s chief complaint, in it’s distilling there is no limit to the range of information considered pertinent (no control for information variance), nor of the operational criteria for deciding whether a particular problem is simply a normal reaction to an abnormal situation or something more (no control for criterion variance).
Consider a person referred with ?chronic fatigue syndrome, the psychological therapist will certainly find evidence to support this because
a) they will rarely be aware of differing criteria for CFS and
b) they will find a symptom to support the diagnosis such as fatigue.
Here we have the operation of a confirmation bias seeking only information that supports the original hypothesis.
Without considering what body of evidence would be needed to refute hypothesis e.g diagnostic entities such as depression that have some symptom overlap with disorders such as CFS and/or an as yet undiscovered entity that might explain the fatigue e.g the development of multiple sclerosis.
http://www.cbtwatch.com/focus-on-the-chief-psychological-complaint-and-miss-the-boat/