Freud described the evolution of his clinical method and set out his theory of the psychogenetic origins of hysteria, demonstrated in a number of case histories, in Studies on Hysteria published in 1895 (co-authored with Josef Breuer ). In 1899 he published The Interpretation of Dreams in which, following a critical review of existing theory, Freud gives detailed interpretations of his own and his patients' dreams in terms of wish-fulfillments made subject to the repression and censorship of the "dream work". He then sets out the theoretical model of mental structure (the unconscious, pre-conscious and conscious) on which this account is based. An abridged version, On Dreams , was published in 1901. In works which would win him a more general readership, Freud applied his theories outside the clinical setting in The Psychopathology of Everyday Life (1901) and Jokes and their Relation to the Unconscious (1905).  In Three Essays on the Theory of Sexuality , published in 1905, Freud elaborates his theory of infantile sexuality, describing its "polymorphous perverse" forms and the functioning of the "drives", to which it gives rise, in the formation of sexual identity.  The same year he published ‘Fragment of an Analysis of a Case of Hysteria ( Dora )' which became one of his more famous and controversial case studies. 
Among the works of Freud, he was most famous for his developmental theory of Psychoanalysis. Freud delved to the understanding and treatment of psychological disorders where he and his friend Josef Breuer discovered the “talking cure” after making a patient suffering from hysteria named Anna O to talk about her traumatic experiences which eventually led to a more developed form of therapy called “free association”. This contributed to the birth of psychoanalysis. Psychoanalysis assumes that the unconscious mind is the most powerful force behind thought and behavior and that dreams have meaning and are the most direct route to the unconscious mind arguing that the conflicting impulses, thoughts, and feelings that threaten the waking mind are released as visual compromise in distorted and disguised form by the sleeping mind. It also assumes that our childhood experiences are a form of a powerful drive in the development of our adult personality and that sexual and aggressive impulsion and the repression thereto are part of the maladaptive behavior of adults.