Germany's single states have come to their final chance either to articulate their will and capacity to survive in constitutional sovereignty, i.e. with meaningful representative bodies of their own (Landesparlamente), or to perish and become mere provinces or regions. Germany's single state parliaments (Abgeordnetenhaus, Bürgerschaft or Landtag) seem to understand that challenge. They installed a specific movement (Konventsbewegung) for the reform of Germany's federalism. After documenting the origin of this movement and analysing the inter-parliamentary development of its organization and its aims, one is lead to a careful evaluation of the movement's probable future: There are signs suggesting a failure while others point to a possible success.