The Section for Sign Linguistics of the University of Warsaw and the Psychology of Language and Bilingualism Lab „LangUsta” of the Jagiellonian University have started a joint project on Polish CODAs (Children of Deaf Adults). Thanks to this endeavor, we hope to be able to broaden our understanding of various cognitive aspects of signed/spoken language bilingualism. We invite all CODAs who are fluent users of both spoken Polish and Polish Sign Language (PJM) to take part in our project.