In the house of representatives, who determines the schedule and rules for debate

House speaker-Elected by the full House. The Speaker has several formal duties including, but not limited to, calling the House to order, referring bills to committees, recognizing Members for speaking purposes, and signing bills passed by the House.
Floor Action- Once a committee has approved legislation, it becomes eligible for debate on the House and Senate floors, where it may be passed, defeated or amended.  Because floor debates often are scheduled on short notice, you should prepare your messages (e.g. e-mails, letters etc.) well in advance. However, keep in mind that timing is extremely critical. Any communications about legislation that is coming up for floor debate should arrive as close to the time of voting as possible.  

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.