A basic concept of the anthroposophical teaching of illness that remains almost unchanged to this day is the concept of the "threefold structure" of the human being developed by Steiner in the early 1920s.<ref>{{Cite book|first=Robert|last=Jütte|title=Geschichte der Alternativen Medizin|publisher=Beck|location=Munich|date=1996|pages=244f|trans-title=History of alternative medicine|isbn=978-3406404955}}</ref> Steiner distinguished three organ systems: | A basic concept of the anthroposophical teaching of illness that remains almost unchanged to this day is the concept of the "threefold structure" of the human being developed by Steiner in the early 1920s.<ref>{{Cite book|first=Robert|last=Jütte|title=Geschichte der Alternativen Medizin|publisher=Beck|location=Munich|date=1996|pages=244f|trans-title=History of alternative medicine|isbn=978-3406404955}}</ref> Steiner distinguished three organ systems: |