This evaluation studied the influence of information and social networks on university employees' decisions to enroll in a voluntary Tax Deferred Account (TDA) retirement plan in the United States. The results indicated that an individual’s decision to participate in the TDA is affected by small changes in their environment (i.e. in their social network), and not only by receiving increased information.

To test the impact of information on teenagers’ sexual decisions, a “Relative Risk Information Campaign” was conducted in 71 schools to give students information about the distribution of HIV infection rates by age and gender groups and discuss the role of cross-generational sex in the spread of HIV. The information led to a significant reduction in unwanted teenage childbearing with older partners, suggesting a decrease in unprotected sex with older partners.

In Vadodora, India, researchers studied the impact of supplementing classroom instruction with computer-assisted learning (CAL) in primary schools. CAL significantly improved student’s math scores, but was less cost-effective than the remedial tutor-based program, Balsakhi.

This study estimated the effect of financial incentives on teacher attendance on students' attendance and math and language levels. The incentives increased teacher attendance and teaching time, and student test scores rose as a result.

Working closely with a highly profitable consumer lender in South Africa, researchers sought to determine the effects of advertising content, price, and offer deadlines on loan take up. They found the marketing had significant effects on loan take up, but not on loan amount or default rates. Clients demonstrated the strongest responses to the non-price components of loan offers.

Researchers worked in Peru to measure the marginal impact of adding business training to a group lending program. The results of this study found business training slightly improved business practices, but had no impact on key business outcomes such as revenue and profit.

Researchers designed and implemented a commitment savings product called a SEED (Save, Earn, Enjoy Deposits) account, which restricted access to savings, thus potentially helping with either self-control or family-control issues. After one year, the commitment savings product led to increased savings and more decision making power in the household for women.

Researchers evaluated whether a package of services, designed to help link smallholder farmers to commercial banks, retail farm suppliers, transportation services, and exporters, could help small farmers in Kenya adopt, finance, and market export crops, and thus make more income. One year after the program began, individuals who received the program were more likely to be growing an export crop, but incomes did not significantly improve.

In this study, researchers randomly selected existing group-lending centers to convert to an individual liability model. They found no difference in repayment rates between individuals assigned individual liability and those assigned group liability, no change in overall profitability for the bank, and a reduction in voluntary savings for those removed from joint liability.

In collaboration with PRISMA, a Peruvian NGO offering credit through village banks, researchers designed and implemented a new loan product, which required new clients to be sponsored by existing clients, to measure the relative importance of social networks and prices for borrowing in shantytowns near Lima. Results demonstrated that borrowers were more likely to obtain sponsorship from friends. Non-friends were more likely to sponsor higher quality borrowers.

Researchers evaluated a mass school-based deworming program in Western Kenya, and found that deworming substantially improved health and school participation of treated children, as well as of untreated children in both treatment schools and neighboring schools. The program reduced school absenteeism by more than one-quarter, and was far cheaper than alternative ways of boosting school participation.

This study evaluated the impact of a preschool nutrition and health project that targeted anemia in the slums of Delhi, India on child health and school attendance. Results showed the program positively impacted weight-gain and school attendance, particularly for groups with high base-line rates of anemia.

Researchers provided educational flipcharts to 89 randomly selected Kenyan primary schools and evaluated their impact on student learning, comparing retrospective and prospective estimates. In the prospective study, the estimated impact of flipcharts on student test scores was found to be close to zero. In contrast, the retrospective study seriously overestimated the impact of the intervention.

Colombia used lotteries to distribute vouchers which partially covered the cost of private secondary school for students who maintained satisfactory academic progress. Three years after the lotteries, winners were about 10 percentage points more likely to have finished 8th grade, primarily because they were less likely to repeat grades, and scored 0.2 standard deviations higher on achievement tests. In the long-run, the PACES program increased secondary school completion rates by 15 to 20 percent.