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==Sigmund Freud==
===Agencies===
In [[Sigmund Freud|Freud]]'s [[theory]] of the [[mind]], the [[mind|psychical apparatus]] was differentiated into a [[number]] of systems of "[[agency|agencies]]", each of which had distinct properties and functions, but which interacted dynamically and in [[conflict]] with each [[other]].
Two of these [[agency|agencies]] can be [[identified]] in [[Sigmund Freud:Bibliography|Freud's writings]].
===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]].
[[Category:Index]]
[[Category:Freudian psychology]]
