The fall of the Dual Monarchy in October 1918, after a half-century existence, gave rise to a Schuldfrage which prolonged by another fifty years the polemics begun in 1867 about the constitutional foundations of the reformed Habsburg state. Both before and after 1918 the pivotal problem of the controversy had to do with the political wisdom and implementation of the Ausgleich or Compromise of 1867. The purpose of this article is to reconstruct the dispute over the Compromise in its successive historical settings through four generations of critics and, with benefit of their insight, to attempt a reassessment of the 1867–1918 edifice from a centennial vantage point.