Results from a pretest-posttest randomized field experiment study with a control group comparing the impact of high- and low-level-facilitated mentoring programs on new employees' performance and perceptions about their jobs and organization were reported in this paper. Results indicated increases in job satisfaction, organizational commitment,…

Interest has rapidly increased in studies that randomly assign classrooms or schools to interventions. When well implemented, such studies eliminate selection bias, providing strong evidence about the impact of the interventions. However, unless expected impacts are large, the number of units to be randomized needs to be quite large to achieve…