If you have a preschooler, kindergartner or even a struggling first grader you will not be sorry you purchase these books! My four yr old told me he wanted to read so we started with set 1 and I have all 5 boxed sets plus the Kindergarten sight words boxed set. Today my preschooler is reading at the same level my first grader was at the beginning of the school year; and my first grader was in the top 3/4 of his class! The books are perfect in every way. The start off using 3 letters a book, one sentence per page and gradually get more complex letter sounds and longer stories. My son WANTS to read and we read twice daily! I taught my now middle schooler how to read at age four also but I know it would've been a lot less stressful (for me) if I would have known about these books. My son practically taught himself to read these books! Just make sure that your child can recognize each letter and knows what sound it makes. We only knew short vowel sounds when we started these, now my son can read words like 'wonderful', 'bright', 'another', 'business' and more! DO NOT HESITATE, buy these for your child; and yourself!!