This document reviews some of the indices of language development which have been constructed since the Anderson study of 1937. In addition to the findings of Anderson, the T-unit proposed by Hunt (1965), the measure of T-unit length and mean number of sentence-combining transformations per T-unit developed by O'Donnell, Griffin, and Norris (1967), the instrument for collecting comparable samples of writing from children at various grade levels developed by O'Donnell (1968), the syntactic complexity scale developed by Endicott (1973), and the Syntactic Density Score developed by Golub and Kidder (1974) are discussed. (HOD)