On this view each dialogue participant's view of the common ground, their Dialogue Gameboard (DGB), is structured by a number of attributes including the following three: FACTS: a set of facts representing the shared assumptions of the CPs, LatestMove: the most recent grounded move, and QUD ('questions under discussion'): a partially ordered set-often taken to be structured as a stack-consisting of the currently discussable questions.
querying and Assertion Both querying and assertion involve a question becoming maximal in the querier/asserter's qUD: 3  Following (Larsson, 2002;Cooper, 2004), one can 3 pushed onto the stack, if one assumes qUD is a stack.