 Freud then integrated these findings with his previous theories concerning the functions of the id, ego and super-ego.As a result, he eventually advanced his concept of resistance by developing it into a multitude of individual forms that included repression, transference, ego-resistance, "working-through", and self-sabotage.The common theory behind many of Sigmund Freud's psychoanalytic techniques, alluding to the fundamentals of psychoanalysis as a science, was that it is possible that memories that have been lost from consciousness provide hints of their existence by the means of prompting certain thoughts and behaviors.