The experimental evaluation of the Big Brothers/Big Sisters program examined 959 10- to 16-year-olds. The youth were randomly assigned to either a mentoring or control group. The youth in the mentoring group were less likely to report lying to their parents, and reported more trust in, and a more positive perception of, their relationship with their mother than the control group youth (Grossman & Tierney, 1998; Tierney et al., 1995).