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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 of these [[psyche|agencies]] can be identified in [[Sigmund Freud:Bibliography|Freud's writings]].
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 [[psyche|agencies]] of [[id]], [[ego]], and [[superego|super-ego]] (''[[Das Es]]'', ''[[Das Ich]]'', ''[[Das Über-ich]]'').
[[Category:Index]]
[[Category:Freudian psychology]]
