The TWEL–3 is a revision of the widely used Test of Early Written Language–Second Edition. It includes two forms, each with a Basic Writing and a Contextual Writing subtest. The TEWL–3 provides standard score indexes (M = 100, SD = 15) for age and grade percentiles, and age and grade equivalents. The selection of items and the development of the subtests are grounded in the available research literature and other evidence of developing literacy ability, including curriculum guides and classroom activities. Item types were selected only if recognized experts in the field have related them to developing literacy abilities. The TEWL–3 Subtests are Basic Writing, Contextual Writing, and Overall Writing.