 Structural rules (Rahmenregeln) determine the general course of a dialogue game, such as how it is initiated, how to play it, how it ends, and so on. The point of these rules is not to spell out the meaning of the logical constants by specifying how to act in an appropriate way (this is the role of the particle rules); it is rather to specify the structure according to which interactions take place. It is one thing to determine the meaning of the logical constants as a set of appropriate challenges and defences (as above), it is another to define whose turn it is to play and when a player is allowed to play a move. One could indeed have the same local meaning (i.e., particle rules) and change a structural rule, saying for instance that one of the players is allowed to play two moves at a time instead of simply one: this would considerably change the game without changing the local meaning of what is said. This is actually one of the main ways the dialogical framework can be used in order to deal with other logical systems, and some examples are discussed in  Section 2.2.