This document proposes a project to create an interactive digital textbook called Lingua2Go to teach language skills to older adults. The textbook would be available as an iBook or mobile app with support in 4 languages. It would include features like audio, glossary items, images, and annotations. The project would involve testing how older adults use such a textbook, adapting existing materials, and producing support materials in multiple languages. Partners in Denmark, Germany, Portugal, Italy, and the UK would create a 10-chapter textbook, provide guidance for teachers, and pilot the textbook in their countries.