Videos available for the first two books can be used alone or with the book. Some parents buy the book only, some the video only, some both. Any of these systems works. I have had very enthusiastic results from parents who are thrilled to hear their toddlers going around the house identifying toys by sound of the first letter and trying to sound out words. I am not pretending my method is the only one that works.
Many methods work.
But this one does, and very logically. The first groups of students are now well into post-secondary, in colleges, universities, professional faculties of law, medicine. One entered the international baccalaureat program at grade 10. I am not saying my method accomplished all that - but my method was part of the voyage. If you would like more information, please write to me.