Peru faced wide gaps in test scores between students from high- and low-income households. Instead of investing more on teacher training and learning materials, the team designed a growth mindset intervention to change beliefs and mental models on the part of educators and students alike. An impact evaluation showed that this simple, one-time 90-minute session increased test scores by 0.2 standard deviations. The cost of the intervention was $0.20 cents per student, which allowed the pilot to reach 50,000 students.
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