The exclusion of `subjectivity' from the scientific debate is based on objectivistic presuppositions. The acceptability of these presuppositions, however, are epistemologically not warranted and not corroborated by emperical facts of the neuro-sciences in particular. The introduction of `subjectivity' in the diagnostic process will bring back `the marrow in the bone'. Discussions about the diagnosis of personality disorders will be revitalized when scientists acknowledge that without an intentional system of subjective knowledge there can be no `marrow' whatsoever. The Autognostic Personality Probe (APP) is presented demonstrating a synthesis of idiographic material and nomothetic analysis.