Freud developed the notion that the human mind has three distinct "provinces," or regions, that involve control and regulation of impulses. on the basis of this notion, the is the seat of impulse and desire and is usually developed in infancy.
multiple choice
ego
id
superego
instinct

An informal structure in a bureaucracy would be something like so-called "office politics". where there's a formal structure set up for the organization, but then an informal subculture as well that has a way of organizing the bureaucracy further. this can be positive because it sets up an added degree of organization, albeit informal, within the bureaucracy.