Many criticisms of psychology as a science have been made on practical, philosophical and ethical grounds. The challenges in establishing psychology as a science are: (i) It is in preparadigmatic state – According to American philosopher, Thomas Kuhn, psychology is still in a preparadigmatic state as it has not succeeded in producing a cumulative body of knowledge that has a clear conceptual cove.

(ii) Issues related to objectivity and validity – Methods used in psychology such as introspection, surveys and questionnaires are subjective. Due to this, psychology lacks two criteria of science, i.e., objectivity and validity.

(iii) Issues related to predictability and replicability – In psychology it is difficult to make exact predictions as people respond differently in different situations. Test result are more varied and hence difficult to replicate.

(iv) Objectifying humans – According to some psychologists, subjecting human behaviour to experimentation amounts to objectifying individuals.