Maladaptiveness of behaviour - according to Darwin's principles of natural selection, any behaviour that is adaptive should be retained through the process of natural selection and survival of the fittest. Behaviour is maladaptive if it interferes with an individual's ability to lead a normal everyday life. Behaviour is abnormal if it is maladaptive, that is it has adverse effects on either the individual or society e.g. not going to school, staying inside all the time, not having relationships with friends