The Workbook includes exercises in grammar, vocabulary and skills, which mirror the language and skills work in the Student's Book pages. There are three levels of practice activities: one-star activities provide basic revision and language manipulation; two-star activities involve more productive exercises; and three-star activities are more open and offer more challenge. There is a two-page Progress review at the end of each unit. These exercises check understanding of all the vocabulary, grammar and skills presented in the unit. They also provide a record of what has been learned in the unit. The Self-evaluation section encourages students to think about their progress. This type of activity is also very helpful in students' development as learners because%