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Dr. Samuel Greiff is the research area group leader, principal investigator, and ATTRACT fellow at University of Luxembourg. He holds a PhD in cognitive and experimental psychology from the University of Heidelberg, and he has been awarded several national and international research funds by the German Ministry of Education and Research and by the European Union. He is currently fellow in the Luxembourg research programme of excellency, has published articles in national and international scientific journals and books, and has an extensive record of conference contributions and invited talks. He is guest editor for the Journal of Educational Psychology and the International Journal of Lifelong Education. He is involved in the Programme for International Student Assessment (PISA) as an external advisor to the PISA 2012 Problem Solving Expert Group and he has been working for several years with applied measurement aspects of 21st century skills and its application in various areas. Currently, he leads a group of test developers, research assistants and students dedicated at increasing the understanding, the measurement, and the application of different 21st century skills.
Dr. Sascha Wüstenberg received his PhD at the University of Heidelberg, Germany, in early 2013. His dissertation with the title “Nature and Validity of Complex Problem Solving” considerably advanced research on CPS. He has already published in several internationally high-ranked journals. His main interest lies in educational measurement of problem solving and he brings along several years of experience in assessing non-routine transversal skills. Dr. Wüstenberg developed computer-based complex problem solving tasks that were included in the scale assessment worldwide, the Programme for International Student Assessment (PISA), in its 2012 cycle. Drs. Grief and Wüstenberg will describe and discuss PISA complex problem solving assessments.