In 1984, the "Advances in Motivation and Achievement" series was launched with Martin Maehr serving as one of the series editors. Professor Maehr has remained a constant in the series that has evolved through this, the 15th volume, and the last on which he will serve as an editor. Over its 25 year history, the series has consistently highlighted the work of top scholars in the field of motivation research, and this volume continues that tradition. The theme of Volume 15 is social-psychological approaches to the study of motivation and achievement, and the chapters herein cover a broad range of topics, from the influence of peers to the influence of color, on motivation and achievement. The contributors include a range as well, from some of the most well-respected veterans in motivation research to influential new voices. The emphasis on excellent and groundbreaking research that Professor Maehr has cultivated in this series is well represented in the current volume, a must-have for motivation researchers.