Presents theories of infant motor development and discusses the unique challenges involved in the assessment of the motor skills of developing infants as compared to that of adults. Provides step-by-step instruction for using the Alberta Infant Motor Scale (AIMS)--a new scale that measures infant motor development. Features a review of the major theories of motor development, line drawings and photographs of each movement skill, and a percentile graph enabling the user to plot and infant's score and derive a visual estimate of his/her percentile ranking.