The Battelle Developmental Inventory - Second Edition (BDI-2) is an early childhood instrument based on the concepts of developmental milestones. As a child develops, he or she typically attains critical skills and behaviours sequentially from simple to complex. The BDI-2 helps measure a child's progress along this developmental continuum by both global domains and discrete skill sets.
The BDI-2 Student Workbook is required for certain Cognitive and Motor items (dependant on age of the child and the domains being administered). Scores for the child's performance on the items in the Workbook are recorded on the Record Form.