This paper raises the following questions: Can OSCE live up to high expectations for conflict prevention and crisis management? Is it able and equipped to meet this demanding task? Is OSCE well-suited and placed to play a central role in European security? Is the role of a "framework organization" a suitable task for OSCE? The underlying issues are about the relationship and links between OSCE and the Atlantic Aliance--whether the ambiguities of OSCE's performance can be warded off, and whether the overall performance of OSCE can be improved by cooperation with NATO.