Research
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Research stays
| Year | Location |
| 1992 | Two-week study visit to the Japan Institute of Labor (scientific institute of the Japanese Ministry of Labor) in Tokyo |
| 1993 | Two-week study visit to Detroit/USA with the US automobile workers' union |
| 1996 | One-week lecture tour to Japan (Kyoto/Tokyo): The German production model |
| 1997 | Four-week study visit to the USA at the invitation of the US Department of State |
| 1998 | One-week lecture tour in South Africa at the invitation of the Friedrich Ebert Foundation: |
| 2000 | One-week stay in London at the invitation of the British Foreign Office: The British Policy Model |
| 2002 | Vancouver/Canada: Lectures on the transformation of the German model in the context of Europeanization |
| 2005 | Center for European Studies, Harvard University |