Notwithstanding an ever-growing body of literature on administrative reforms, the studies either focus on single countries or emphasize common tendencies in all countries; hence providing little systematic insight for the evaluation and explanation of administrative change from a comparative perspective. In the light of this deficit, it is the aim of this article to develop an analytical concept for explaining cross-national variances in patterns of administrative development. For this purpose, the concept of national administrative reform capacity is developed, arguing that the potential for reforming different administrative systems is basically dependent on the general institutional context in which these systems are embedded. On this basis, two ideal type constellations of administrative reform capacity and corresponding patterns of administrative development are identified and illustrated by a systematic comparison of administrative reform capacities and administrative changes in Germany and Britain.