A "meta-analysis" collates and the results from multiple independent research studies of a single subject to provide a more reliable evaluation of the tested hypothesis. Increasingly common, meta-analyses are an important way of sifting through often contradictory or confusing results from multiple studies reported independently.
This meta-analysis in the news caught my eye because it reported an average increase in academic achievement by 11 percentile points associated with "Social and Emotional Learning" programs. A gain of 11 percentile points is huge when compared to effects from other strategies employed in schools. The analysis included a review of a whopping 213 studies involving 270K students K-12, and noted improvements in student attitude and behaviour as well.
What is "Social and Emotional Learning"? SEL programs seek to teach children "to recognize and manage emotions, set and achieve positive goals, appreciate the perspectives of others, establish and maintain positive relationships, make responsible decisions, and handle interpersonal situations constructively"