Field experiments in education frequently assign entire groups such as schools to treatment or control conditions. These experiments incorporate sometimes a longitudinal component where for example students are followed over time to assess differences in the average rate of linear change, or rate of acceleration. In this study, we provide methods…

A three-stage model was designed to improve leadership training and improve instruction for Indiana vocational youth organizations. The model was field tested using a pretest-posttest, control-group design administered to five classrooms representing each of six vocational youth group organizations. Both formative and summative data were…