The document discusses the siLang project, which aims to promote professional language skills for non-native speakers by developing a situated serious mobile game. The game will immerse learners in work-related language scenarios to address the diverging uses of vehicular languages across cultures. It will analyze language needs, develop "foldback stories" incorporating cultural aspects, and implement these stories in a mobile game. The game aims to improve business communication skills through role-playing and narrative immersion. The project will validate the approach across several European countries with professionals, vocational workers and students.