The WJ IV ECAD measures general intellectual ability, early academic skills and oral expression in all children ages 2-6 through 7-11 and children with cognitive developmental delays through age 9-11. With its combination of unique new material and early-form content adapted from trusted WJ IV tests, ECAD provides a dynamic way for examiners to assess emerging cognitive abilities and academic skills in young children and children with cognitive delays using contemporary, theory-based measures.