How did Bush's relationship with Gorbachev compare with Reagan's?
0 Bush was on friendlier terms with Gorbachey, while Reagan was more confrontational
Reagan and Gorbachev had a closer working relationship.
Bush and Reagan had very similar working relationships with Gorbachev.

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.