Back to Resource Library What is the state of play? G.M. Burghardt · 2015 ★ NIFPlay Rating: 9 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 Burghardt's major review paper assessing the current state of play research, evaluating advances in understanding play's functions, mechanisms, and evolution, and identifying priority questions. View Resource
