A valid assessment tool that measures active play is not yet available due to the sporadic and spontaneous nature of play, as well as the potential differences in how active play is understood and measured across different age groups, cultures, and contexts. The purpose of this review was to identify the scope and gaps in the measurement of active play based on data gathered from 68 countries that participated in the Global Matrix (GM) initiative, led by the Active Healthy Kids Global Alliance (AHKGA). GM is the global-level, biennial evaluation system of physical activity related behaviors among children and youth, including the Active Play indicator, and the sources of influence using letter grades (ranging between "A" and "F").
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