 Raw scores of successfully completed items are converted to scale scores and to composite scores.These scores are used to determine the child's performance compared with norms taken from typically developing children of their age (in months).The most recent edition, the Bayley-III has three main subtests; the Cognitive Scale, which includes items such as attention to familiar and unfamiliar objects, looking for a fallen object, and pretend play, the Language Scale, which taps understanding and expression of language, for example, recognition of objects and people, following directions, and naming objects and pictures, and the Motor Scale, which assesses gross and fine motor skills such as grasping, sitting, stacking blocks, and climbing stairs.