A new paper from Professor Betsy Levy Paluck published in Behavioural Public Policy evaluates the state of contact hypothesis research.
Assessing field experiments with one day or more between contact and outcome measurement, the study finds that intergroup contact typically reduces prejudice, with some important caveats. The number of studies meeting the research criteria is just 27, and among those, none addressed interracial prejudice among adults, an especially important category for policymakers. Also, more powerful studies find smaller effects.
The contact hypothesis re-evaluated