The authors are known and respected. I recommend this strongly for use in class, library and at home. This is like a dictionary of all the terms that you will ever need. Not only does the book explain what you nedd to know it goes further to give examples quite often. The book is an a-z and if a word has two meanings or more it will list them all but tell you the other item to lookup so you can find it however you have been taught. The book is updated regularly and this is the most up to date book, and it has a revision checklist for all the major exams boards. So this is a great book from september all the way until the exams within the two years.