... For nearly 50 years, researchers have observed that children's spelling develops in a predictable and consistent manner. Beginning with the work of Charles Read (1971Read ( , 1975 and Carol Chomsky (1971), and later Edmund Henderson (Beers & Henderson, 1977;Henderson & Beers, 1980;Henderson, Estes, & Stonecash, 1972), researchers found that students use the three layers of written language (sound, pattern, and meaning) to help them spell unknown words. Their spelling develops sequentially, generally starting with letter-sound correspondences and short vowel patterns in single-syllable words (e.g., pat, ten, and fit), moving to long vowel and other vowel patterns (e.g., cape, throat, fight, and chew), then applying and extending these understandings to words with two or more syllables, including the addition of prefixes and suffixes to base words (e.g., bedrock, carrying, pirate, and rewrite), and later, understanding the influence of word parts, or morphemes, including Greek and Latin roots (e.g., visit, vision, revise, and advisory). ...