The Lexia LETRS® (Language Essentials for Teachers of Reading and Spelling) Suite is comprehensive professional learning designed to provide early childhood and elementary educators and administrators with deep knowledge to be literacy and language experts in the science of reading. Developed by Dr. Louisa Moats and leaders in the field of literacy, Lexia LETRS teaches the skills needed to master the foundational and fundamentals of reading and writing instruction—phonological awareness, phonics, fluency, vocabulary, comprehension, and written language.