About the Measure

Domains Language
Subscales Total score, auditory comprehension expressive communication
Target Construct Oral language: Pre-verbal, interaction-based skills to emerging language and early literacy
Description A comprehensive developmental language assessment, with items that range from pre-verbal, interaction-based skills to emerging language and early literacy.
Test Authors Zimmerman, I. L., Pond, R. E. & Steiner, V. G.
Publisher Pearson (2014)

Implementation details

Respondent Caregiver up to 2:11, then child.
Prior knowledge Required Trained professionals such as speech or occupational therapists, mental health professionals and health practitioners with appropriate Graduate and professional qualifications in their field of practice.
Scoring Scoring clear and transparent but need to be careful about establishing basal scores
Time 25-35 minutes for children aged birth through 11 months to 45-60 minutes for children over one year.
Age Birth to 7 years and 11 months

Psychometric details

UK norms YES (US for children under 2 years and 6 months)
Norm / Criterion referenced Norm referenced
Standardisation sample 800
Reliability With the exception of age group 6:0-6:5 years, the values for Cronbach’s alphas are generally very good and are excellent (> .90) for the Total Language standard scores.
Criterion validity Insufficient data in the public domain to evaluate
Construct validity Validity demonstrated by providing various types of evidence to support a test's interpretation and uses. These are not different types of validity; they are simply different types of evidence that, in totality, provide an evaluation of validity (AERA, APA, NCME, % ARA, 1999). More on validity reported at PLS-4
Concurrent validity Concurrent validity with PLS-4 is .80 for the Auditory Comprehension and Expressive Communication scales and .85 for Total Language. Correlation ranged .70 to .82 with CELF