This dico really great because it focuses primarily on the words that are not in the basic English vocabulary taught in college and high school and needed to read Harry Potter in English. Anyone a little serious and wants to progress quickly in English has only gradually memorize the dico between each reading of the series of seven books. It's like 'pages voca a beginner would do in English by reading the series except that here we do not have to make it already is! Of course we can complete them according to the level of each but most of the work is done! Guaranteed efficiency ...