Human Capital Mobility – A Comparable Knowledge Indicator Ebbe Krogh Graversen The Danish Institute for Studies in Research and research Policy Finlandsgade 4 DK – 8200 Aarhus N. Denmark Acknowledgements: Financial support from the Danish Institute for Studies in Research and Research Policy is gratefully acknowledged. Mette Lemming has performed valuable research assistance. Science and Technology Indicators in the Nordic Countries; chapter 4