Relationships among people are a. one of two types—social or working. b. usually simple and easy to understand. c. something that must be maintained to stay healthy and strong. d. not influenced by people's ideas and attitudes.

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.