Presented is a sequential motor development model for use in the assessment of physically handicapped children by physical educators, and discussed is criterion testing and its role in the identification of motor development. The author points out that professionals are generally relied upon in the areas of auditory and visual evaluations, and discusses the following instruments for use in assessing developmental factors related to the sensory - motor model: Fiorentino's Reflex Test of Central Nervous System Development, the Lincoln - Oseretsky Motor Development Scale, the Purdue Perceptual Motor Survey, the Frostig Test of Visual Perception Development, and the Southern California Battery of Perceptual Motor Tests. Needs in the areas of order and agreement in regard to the sequential nature of motor development, assessment of development, and target behavior expectations for various handicapping conditions are reported. (IM)