Explode the Code is a series of workbooks that take a child from learning letters through reinforcement of phonetic patterns when the child is reading fluently. The Get Ready, Get Set, Go for the Code series is for PK. Explode the Code covers K-4th grade. Beyond the Code is a series of workbooks that teach reading comprehension and thinking skills. It can be used alongside the Explode the Code series. You can read more about the Explode the Code curriculum at the ChristianBook.com website.