Little Hans was referred to Freud by his father- a keen supporter of Freud's work.
Freud documented the case of Little Hans to show how his fears, dreams and fantasies were symbolic of his unconscious passing through the phallic stage of psychosexual development.
Freud used the study to support his ideas about the origins of phobias, his theory of infantile sexuality, the Oedipus complex and his belief in the effectiveness of psychoanalytic therapy.