The European Sociological Review published an article on the Polish Panel Survey POLPAN (https://doi.org/10.1093/esr/jcab017). The survey began in 1987, before the fall of communism, and then continued on a five-year cycle, each time supplementing the sample with young age groups. Presenting the challenges facing the POLPAN survey, the article refers to the CNB-Young project, the aim of which is to develop a new approach to harmonizing POLPAN data with data from panel surveys conducted in Germany (SOEP), Great Britain (BHPS / UKHLS), and the USA (NLSY-79),