Nicola Bazoli is a research collaborator at the Research Institute for the Evaluation of Public Policies (IRVAPP). He is currently a third year PHD student at the Department of Statistical Science, University of Bologna. In 2014 he obtained a Master degree in “Sociology and Social Research” at the University of Trento with a dissertation titled “Apprendimenti scolastici e presenza di alunni stranieri in classe. Un’analisi condotta sui test Invalsi di competenze linguistiche e matematiche degli alunni di 5a elementare nell’ a.s. 2010/2011”. His research interests include students’ achievement, item response theory and statistical characteristics of items of standardized tests.