Psychobiography has also conflicted with contemporary views of science since its origin because it contains no controlled variables or experimentation. In its early years it was dismissed as unscientific and not a legitimate addition to the field of psychology due to the push towards experimentation focused on physiological and biological factors, and away from philosophical psychology, to establish it as a natural science. The value of psychobiography to psychology is comparable to forensic science and archaeology, offering detailed analyses of subjects with an emphasis on contextual information, but due to the qualitative nature of this information it remains a challenge to validate psychobiographical works as empirically based applications of psychology.