My sincerest thanks to all of the children and staff who participated in this project, for their time, enthusiasm, and laughs along the way, as well as the staff at PlayBoard NI including Jacqueline O'Loughlin and Shauneen McCusker, who kindly shared their wisdom and expertise.Finally, I wish to thank my family and friends who have supported me from day one, in particular my parents for their endless encouragement and belief in me, Ryan and Bandit for always being there, and my fellow PhD researchersespecially Ruth (Dr Neill), Cathrinea and Hannahfor the advice, support, and making training days much more fun.