Critical Thinking sections give students the tools they will need to formulate their own opinions and express themselves effectively in the end-of-unit academic tasks. Unique research from the Cambridge English Corpus into common learner errors focuses the language used in Unlock on those areas your learners will find most challenging. In addition, the Unlock Academic Vocabulary Wordlist (developed using Coxhead's Academic Wordlist and other Corpus research) means students will acquire the academic vocabulary they need, even from the lowest level. Videos from Discovery Education (TM) provide a powerful introduction to a range of academic subjects by activating students' awareness of the topic and adding interest and authenticity to the lesson. The topics and exercise types in Unlock provide practice and key language for IELTS test candidates.