This final report details the outcomes of a 3-year project involving children with severe disabilities (ages birth-6) designed to: (1) determine the effectiveness of specific therapeutic intervention techniques on the development of basic motor skills in young children with severe and multiple disabilities; (2) explore the relationship between specific motor skills and the development of other associated motor skills; and (3) determine the effectiveness of "packages" of therapeutic intervention techniques on the development of basic motor skills. Individual studies investigated using vibration, vestibular stimulation, and inversion techniques. Results found in the six studies utilizing vibration, that 8 of 18 subjects (ages 1-6) with severe and multiple disabilities demonstrated an increase in head erection or sitting. In the five studies that used vestibular stimulation, 8 of 10 children in the head erect studies and 6 of 7 children in the sitting studies showed an increase in ability. The results in two studies involving eight children and utilizing inversion suggest that the static method may be more effective for increasing head erect behavior than a dynamic method of inversion. A final study involving two children found vestibular stimulation may be a potential antecedent stimulus for a variety of motor programs. (Contains 93 references.) (CR)