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This study evaluated the efficacy of three different types of emails in encouraging group membership: an impersonal email, a personalized email, and a personalized email that included an element of social pressure. Researchers found that membership increased most among recipients of the social...

Researchers examined the effects of personal canvassing, phone calls, and direct mail on voter turnout shortly before the 1998 general election in the US city of New Haven. Personal canvassing had a far greater influence on voter participation than three pieces of professionally crafted mail...

Researchers evaluated the impact of mailings that informed people with a record of felony conviction of their eligibility to vote on political participation. The mailing increased political participation, particularly among individuals that were active voters prior to incarceration.

In the United States, researchers evaluated the impact of a cognitive behavioral therapy (CBT) program designed to teach high-risk male students in secondary schools to regulate harmful, automatic behaviors. Results demonstrated that the program led to a significant drop in arrests per student...

In this randomized evaluation in Zimbabwe, researchers studied how social media messages targeting misinformation can affect people’s beliefs about and responses toward Covid-19. The study found that these messages increased participants’ knowledge of Covid-19 information by 7 percentage points and...

In Northern Nigeria, researchers are testing the effect of providing mothers with unconditional cash transfers, coupled with varying levels of information and guidance on nutrition, to encourage parents to use funds for their children’s nutrition and food security.

Researchers conducted a randomized evaluation to measure the impact of an information program on parental school choice and long-term student achievement. They found that the intervention shifted household school choices of those who were not enrolled before the intervention toward establishments...