In [[==Sigmund Freud|Freud]]'s theory of the [[mind]], the [[psyche|psychical apparatus]] was differentiated into a number of systems of "[[psyche|agencies]]", each of which had distinct properties and functions, but which interacted dynamically and in conflict with each other.==
Two ===Agencies===In [[Sigmund Freud|Freud]]'s [[theory]] of the [[mind]], the [[mind|psychical apparatus]] was differentiated into a [[number]] of these systems of "[[psycheagency|agencies]] can be identified ", each of which had distinct properties and functions, but which interacted dynamically and in [[Sigmund Freud:Bibliography|Freud's writingsconflict]] with each [[other]].
The first theory, dating from about 1900 - the "[[first topography]]" - distinguishes between the [[unconscious]], Two of these [[preconscious]] and [[conscious]], while the "[[second topography]]", dating from [[{{Y}}|1923]], differentiates the three [[psycheagency|agencies]] of [[id]], can be [[egoidentified]], and in [[superegoSigmund Freud:Bibliography|super-ego]] ('Freud'[[Das Ess writings]]'', ''[[Das Ich]]'', ''[[Das Über-ich]]'').
===First and Second Topography===
The first theory, dating from [[about]] 1900 - the "[[first topography]]" - distinguishes between the [[unconscious]], [[preconscious]] and [[conscious]], while the "[[second topography]]", dating from [[{{Y}}|1923]], differentiates the [[three]] [[agency|agencies]] of [[id]], [[ego]], and [[superego|super-ego]] (''[[Das Es]]'', ''[[Das Ich]]'', ''[[Das Über-ich]]'').
There is overlap between these two models, e.g., the [[ego]] and [[superego|super-ego]] are partly [[preconscious]] and partly [[unconscious]].
