Study Design: A pretest-posttest control group design was applied. Two groups were involved in this project: hospital based program, and regular therapy program. The participants were randomly assigned to one of the two groups by using the well-sealed, opaque envelopes when they are recruited in the study. Once the participants were recruited in the study, the research team modified a toy car based on each participant's capabilities during this pre-intervention phase (the first two or three weeks before intervention starts), e.g., seat and steering wheel modifications. The study duration for each participant was 18 weeks, including 9-week intervention and 9-week follow-up.