Patricia Alexander (2018) provides a thought-provoking analysis of the past and future of educational psychology. Based on the themes in Alexander's paper, the present paper explores the past and future of educational psychology's contributions to: (a) the science of learning, corresponding to Alexander's theme of "a focus on learning as a…

Within-class experimental designs are subject to diffusion effects whereby both experimental and control students benefit from the intervention, thereby contaminating the control group and biasing evaluations of intervention effects. In support of diffusion effects, this study showed that a classroom intervention resulted in higher academic…