Researchers used two randomized evaluations, an online survey and a field experiment, to test how personality traits affect responses to persuasive appeals to vote. They found that individuals with high levels of openness were most responsive to a range of appeals.

Researchers evaluated whether disclosure of past voting participation had a stronger impact on turnout when it reminded voters of instances in which they previously voted or of instances in which they failed to vote. The results suggest that mailings disclosing past voting behavior had strong positive effects on voter turnout, and that these effects were stronger when voters were told of a recent election in which they failed to vote.

In partnership with candidates, researcher Alan Gerber conducted five randomized evaluations in two states to measure the effect of campaign mailings on vote shares. The results suggest that incumbent spending has a negligible effect on vote share, whereas challenger spending was effective.

Helping families with young children living in high-poverty housing projects to move to lower-poverty neighborhoods improves the later-life outcomes for the children and may reduce the intergenerational persistence of poverty.

Researchers sought to determine whether providing information on the EITC could increase the amount individuals received by randomizing the information professional tax preparers supplied. They found that providing more information did not increase EITC transfers or annual earnings overall.

Researchers measured the effect of class size, teacher quality, and classroom quality on earnings and other future outcomes for children participating in the Student/Teacher Achievement Ratio (STAR) project in Tennessee. The study found that smaller class sizes raised college attendance, more experienced teachers increased future earnings of their students, and higher quality classrooms improved both college attendance and future earnings. Researchers found that the positive effects of early childhood education on test scores diminish over time, but positive effects on non-cognitive outcomes persist through adulthood.

In a series of evaluations, researchers took advantage of a lottery that gave low-income uninsured adults the chance to apply for Medicaid in the United States to examine the impact of health insurance on these outcomes over the first two years.

Researchers randomized the suggested contribution in a fundraising appeal sent to patrons of the Bavaria State Opera (Germany). They found that the suggestions increased the average donation while decreasing the participation rate, resulting in no significant change in the average return per mailing.

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 delivered within two weeks of Election Day. Calls from professional phone banks were even less effective than direct mail at increasing voter turnout.

Researchers expanded microcredit offerings in Sonora, Mexico to evaluate the effect of improved credit access on economic and social outcome. They found that microcredit increased access to formal financial services and enabled some businesses to expand, but did not increase household income or prompt new business creation.

Subsidizing entrepreneurship training in the United States did not improve access to training services or promoted employment among groups affected by discrimination.

In Tanzania, researchers examined whether making cash payments conditional on testing negative for sexually transmitted infections (STIs) can improve safe sex practices among young adults. They found that offering cash incentives of US$20 significantly reduced STI rates after one year, although smaller incentives of US$10 had no effect.