In this article, the author reviews the Battelle Developmental Inventory, 2nd edition (BDI-2), a criterion-referenced, individually administered, standardized assessment used to measure the developmental skills in children aged birth through 7 years, 11 months. The BDI-2 is composed of 450 items grouped into five domains (Adaptive, Personal/Social, Communication, Motor, and Cognitive) and a 100-item Screening Test. It can be administered in either English or Spanish. The BDI-2 is a revision from the Battelle Developmental Inventory (BDI). Changes from the BDI include reducing the number of subdomains and repositioning the items that were in removed subdomains, expanding the normative sample, expanding the normative tables, inclusion of a student workbook for all items requiring a response from the child, revised basal and ceiling rules to a uniform three consecutive 2-point responses for basal and three consecutive 0-point responses for ceiling, and improving the visual stimulus materials. The BDI-2 is primarily designed for use by preschool, kindergarten, and primary school teachers, although many other professionals may also find the BDI-2 useful in measuring the functional abilities of young children. The author finds that reliability data are strong, and validity data indicate moderate correlations with other established tests. Although the Screening Test consists of items that had the highest correlations to total test score, separate reliability and validity studies would have been helpful to fully determine its adequacy and appropriate use. Strengths of the BDI-2 include the adaptive method of administration, coverage of a wide range of skills, and child-friendly materials. The manipulatives are inviting for the children and make it quite easy to get them to engage in the tasks. In general, the BDI-2 is an acceptable and useful assessment to administer.