Researchers in achievement motivation are becoming all the more aware of the importance of affect in motivation and self-regulation. This leads to extension and integration of existing theories as well as to new theories that provide a good account of existing data and offer new insight into the mechanism underlying the functioning of motivation. This book presents up-to-date basic research in motivation and self-regulation and an overview of the field, with particular emphasis on issues such as change of motivation, effects of context and culture on motivation, relations of cognition and affect in motivation and self-regulation, and motivation in school, in sports, and in the aged.