Raz-Plus's ELL Resources are designed using scientifically based instructional models, including the SIOP model (Echeverria, Short, and Vogt, 2003) and the Picture Word Inductive Model. These resources are correlated to the WIDA (World-Class Instructional Design and Assessments) standards and incorporate recommendations from the National Literacy Panel's 2006 report, Developing Literacy in Second-Language Learners. Find out more about ELL research, authors and contributors.