Questions are the entry fields of a UserInterface. Questions are coupled to Assignments, this can be done at design time or at runtime. Before a UserInterface can be processed by a Configuration, it is converted to an Input XML Document by placing each coupled Assignment in an Input XML Document using its Elementname, its Paths and its Value. It is also possible to generate a UserInterface based on an Output XML document. In that case the Values from the Questions come from the XML document.