Camiel Hamans is associate secretary-general of CIPL, Comité International Permanent des Linguistes. Previously, he was visiting professor of Dutch Linguistics at Adam Mickiewicz University, Poznań, and secretary general of the Dutch Social Democrats in the European Parliament. He has published on morphology, language change, history of linguistics and minority languages. Katarzyna Dziubalska-Kołaczyk is Professor of linguistics and vice-rector for research of Adam Mickiewicz University, Poznań. She has published on phonology, phonotactics and language acquisition, advocating Natural Linguistic approach to language, e.g. Beats-and-Binding Phonology. She is the Editor-in-chief of Poznań Studies in Contemporary Linguistics and the Organizer of the Poznań Linguistic Meeting. Anna Balas is University Professor at Adam Mickiewicz University, Poznań. Her research focuses on second and third language acquisition of speech.