Prof. Dr. Claus H. Carstensen is Professor of Psychology and Methods of Educational Research at the University of Bamberg. Claus H. Carstensen was born in Munich in 1967, studied psychology at the University of Kiel and graduated with a diploma in 1996. While being employed at the Leibniz Institute for Science and Mathematics Education (IPN) at the University of Kiel, he took up a doctoral degree in psychology. He completed his doctoral thesis on “Multidimensional Test Models With Applications in Educational-Psychological Diagnostics” at the Faculty of Arts and Humanities, University of Kiel, in 2000. Afterwards, he became Research Officer in the Australian Council for Educational Research (ACER), where he was responsible for data analysis and scaling of competence data for the OECD study “PISA 2000”. In 2002, he became Junior Professor for Research Methodology and Educational Research at the Leibniz Institute for Science and Mathematics Education (IPN) at the University of Kiel. He received a positive evaluation in 2006 and took over as Deputy Head of the Department of Educational Science and as Head of the Department of Research Methodology at the IPN; he transferred to Bamberg in October 2008. His research focuses on educational science and its methods; he was in charge of data analyses for PISA 2003 in Germany and was instrumental in the scaling of competences during the first three PISA studies in Germany (2000, 2003, 2006). Further research interests include the survey of competences in children and youths and methods for analyses of longitudinal data in educational research. In pillar 1 of the NEPS, Claus H. Carstensen is responsible for methods of competency assessments.