This handbook enables readers to gain a deep understanding of past, current, and forthcoming research and applications in the field of educational technology. Readers develop an in-depth understanding of complex theories, strategies, concepts, and methods underlying the design, development, implementation, and evaluation of educational technologies. Discussing both the current state-of-the-art as well as emerging technologies, the handbook serves as a comprehensive guide for researchers and practitioners working in education and training. This Second Edition features completely revised and updated chapters that reflect the latest developments in the field.