This is a truly interactive DVD rom for the ATPL Met made by Oxford Aviation. Makes it much easier to study and concentrate especially for someone as busy as me. Reading books probably has no substitute as some say but this DVD works perfectly for me. Animations etc make it easier to understand topics being taught and i would rather that than having a series of colour pictures/ diagrams even in the best of books. Suffice to say I am struggling in the one subject where they don't have one of these DVDs. Highly recommended.