This student guide to explains that abnormal psychology is a division of psychology that studies people who are “abnormal” or “atypical” compared to the members of a given society.
The concept of abnormality is imprecise and difficult to define. Examples of abnormality can take many different forms and involve different features, so that, what at first sight seem quite reasonable definitions, turns out to be quite problematical. Deviating from the norm.
Those who stray too far from the average on this curve are then considered abnormal. However, this definition, has its problems. It does not recognize valuable derivations, such as genius, nor does it recognize common but maladaptive Behaviour like smoking and drinking. Most importantly, this boo offers numerous academic references and resources, including a list of the most most common psychological tools used by qualified mental health practitioners, for diagnosing abnormal behaviours.