The Welcome to Our World Big Books are three levels of original stories (4 per level). Each book supports the theme and language of two units of Welcome to Our World. Teach English through music, motion, and culture with Welcome to Our World, Second Edition, a 3-level series for very young learners of English. With preparation for literacy, numeracy, and phonics, and a focus on real communication in English, Welcome to Our World prepares very young learners to use English and join a world that’s waiting for them.