We extend our gratitude to Erwin Tschirner for his insights into frequency vocabulary, our interns Madeleine Höfer, Bolin Ai, and Mina Ahl, as well as the dedicated members of our Impuls Deutsch Community—teachers and students—who tested early prototypes, provided feedback, and offered suggestions. Special thanks go to Nathan Bates, Anke Duerr McCown, Sigrid Fertig, Emily Frazier-Rath, Adam Gacs, Maria Gallmeier, Alexandra Hagen, Erika Hille Rinker, CJ Jones, Mareike Lange, Ulrike Malandro, Stephanie Mauro, Tobias Müller, Cori Peet, Karen Rosenflanz, Julia Ruck, Anne Schreiber, Martin Sheehan, Michelle Stigter, John M. Thompson, Manuela Wagner, and Susanne Wagner.