The below questionnaires are part of the ST4ADU (Sustainable Tourism for Adult) project, which aims to develop advanced training modules in sustainable tourism practices for adult learners and vocational education programs. Your input will help us identify gaps in current training offerings and design relevant complementary educational content. Your participation will play a key role in shaping future training that empowers adult learners and professionals to contribute to a more sustainable tourism industry. Your input is extremely valuable. By sharing your experiences, needs, and perspectives, you will help us identify gaps in existing training opportunities and design relevant, high-quality educational content that responds to real challenges in the tourism sector. The results of this survey will directly contribute to the creation of complementary learning materials that support sustainability, innovation, and employability.