Each book of the Penguin English tests covers the equivalent of 50 hours' teaching. There are ten tests in each book; nine of them are carefully graded into three levels of difficulty and record the student's progress within each level, while the tenth test in each book is Review Test, covering the whole range of work at that level. Each test consists of 40 items dealing with key areas of grammar; phonology, vocabulary and usage. Each test is designed to be administered in 30-40 minutes. The tests include some new ideas for assessing language competence, and are intended to stimulate and interest the students at the same time as measuring their progress. The tests have been thoroughly pre-tested on both single and mixed language groups.