The paper is an account of the events ending the jubilee year of the University of Lodz and the Department of Social Pedagogy, entitled Social Pedagogy at the University of Lodz: Past – Present – Future, which included two parts: a panel discussion around the issues contained in the book by J.-M. Barbier Vocabulaire d’analyse des activités. Penser les conceptualisations (Lexicon of the activity analysis. Conceptualizations of customary terms) and an exhibition devoted to the history of social pedagogy at the University of Lodz. The event was also a celebration of the centenary of the birth of Professor Irena Lepalczyk occurring on 1 October 2016. The discussion focused on key terms for the author’s own concept of activity analysis, presented in the Lexicon. The emphasized elements included the proposal of unobvious meanings as well as the original structure of the book.