International Journal of Play Therapy26.3 (Jul 2017): 160-171. Research to investigate the efficiency, appropriateness, and feasibility of a directive play therapy approach for children with complex needs must consider methodological issues that impact on internal and external validity. This paper discusses methodological issues that arose when research was concerned with a directive play therapy approach called Learn to Play Therapy with children with autism and related disorders. To read the full article, log in using your NHS OpenAthens details.