In this thoroughly revised edition of the bestselling "e-Learning and the Science of Instruction" authors Ruth Colvin Clark and Richard E. Mayer-- internationally-recognized experts in the field of e-learning--offer essential information and guidelines for selecting, designing, and developing asynchronous and synchronous e-learning courses that build knowledge and skills for workers learning in corporate, government, and academic settings. In addition to updating research in all chapters, two new chapters and a CD with multimedia examples are included.