Appropriate and Inappropriate Interpretation and Use of Test Scores in Early Intervention

Two types of test scores are often used for determining eligibility for early intervention services: standard scores and developmental-age scores. Because they are derived using different methods, these two types of scores do not provide equivalent information. Characteristics of norm-referenced and criterion-referenced tests and the scores available on these tests are reviewed. Valid use of test scores is discussed and cautions regarding the interpretation and use of developmental-age scores are presented. Suggestions for early intervention practitioners are offered.