As part of a competitive group of national and international universities, the U15 universities regularly assess their own performance by means of qualified ratings, among other indicators. However, rankings of universities that are structurally very different and operate on different legal bases can only reveal us so much. Most importantly, the universities involved must agree on the criteria and methods of such rankings. German universities face another challenge with respect to international comparisons--a strong non-university research sector in Germany that is evaluated separately. Under the premises of participation, transparency and communication, the U15 universities welcome the efforts of the German Council of Science and Humanities to establish qualified ratings that take into account the differing scientific approaches of the various disciplines. Furthermore, U15 advocates conducting ratings as warranted rather than at set intervals.