1. Expert Hearing at the German Bundestag on the Intergenerational Justice Law (15 August 2008 im "Reichstag" in Berlin).

2. Expert Hearing of the Financial Committee of the State North Rhine-Westphalia (4 March 2007 im "Landtag" in Düsseldorf).

3. Expert Hearing of the Financial Committee of the State North Rhine-Westphalia (6 Feb 2003 im "Landtag" in Düsseldorf).