Ages: 4 through 12Testing time: 15 minutesAdministration: IndividualAssess two key factors render children suspect for developmental apraxia of speech. The STDAS-2 has four subtests. The first subtest, Expressive Language Discrepancy, is a required prescreening task. For this subtest, the difference between expressive and receptive language age is calculated if receptive language age is higher than expressive language age. This discrepancy remains the best indicator for further testing of developmental apraxia of speech. The other three subtests, Prosody, Verbal Sequencing, and Articulation, are core subtests.