- The Preschool Languag e Scale-3 (PLS-3) (Zimmerman, Steiner, & Pond 1992) is a standardized language test that is used to measure the language development of children with normal hearing aged 0 months to 83 months. The test evaluates "Expressive Communication" and "Auditory Comprehension" and is designed to evaluate skills in a variety of areas: vocal development, social communication , attention, semantics (content), structure (form), and integrative thinking skills.