Back to Resource Library Clinical outcomes of interactive intensive and individual (3i) play therapy for children with ASD: A two-year follow-up study Liao, S.T., Hwang, Y.S., Chen, Y.J., Lee, P., Chen, S.J., Lin, L.Y. · 2014 ★ NIFPlay Rating: 4 Rating Scale 10 Rigorous play-specific science 6–9 General biological science 5 Sound play research (uncontrolled) 1–4 Less rigorous / indirect 0 Indirect but high value Two-year follow-up of the 3i play therapy model for children with autism, documenting sustained gains in social engagement, communication, and play skills. View Resource