Perspectives is a four-skills series in American and British English that teaches learners to think critically and to develop the language skills they need to find their own voice in English. The carefully-guided language lessons, real-world stories, and...
"Clockwise" is designed for learners who want to make effective progress in a short time. It concentrates on developing fluency, refreshing key grammar areas, and extending vocabulary. It provides material of 40-60 hours per level.