Kamil Długosz, M.A. is a PhD student in the Department of Studies on Multilingualism in Institute of Applied Linguistics, Adam Mickiewicz University, Poznań. He writes his dissertation on the subject of Polish-German children bilinguality under the supervision of Prof. Aldona Sopata. He received his master’s degree from the Maria-Curie-Skłodowska-University, Lublin in 2004 with a study on the code-switching from psycho- and sociolinguistic points of view. Furthermore, his research interests include cross-linguistic influences, glottodidactics and psycholinguistics.