Those schools would then be randomly assigned[43] into four experimental groups: (1) phone-free, (2) play-full (that is, Play Club plus extra recess), (3) phone-free plus play-full, and (4) the control condition, in which each school carries on with whatever it was doing before, but is asked not to change phone or recess policies.[44] In just two years, we’d find out whether these interventions work, whether one of them is stronger than the other, and whether there is an added benefit to combining them.
