The 2015 edition states that it is Correlated to the Current State Standards but is basically the same as the previous edition (2007 copyright) except for the cover. The book combines four important skill strands - phonics, structural analysis, vocabulary, and dictionary skills - at each level. Four types of lesson pages offer thorough, clearly focused, systematic skills practice. Instruction pages introduce the skill; reinforcement pages provide practice, using context as well as phonics skills to help build the connection from decoding to comprehension; frequent review pages emphasize skill application; assessment pages provide feedback. As with other secular phonics lines, you may want to go a grade level ahead, especially if you're using a Christian school reading or spelling program. These are comprehensive books; most are over 150 pages long! Unlike other phonics workbooks, they include an answer key right in the book. Two-toned. This series was revised in late 2006. Changes include a revised sequence between skills covered, and more nonfiction activities.