Introduction Jan L. Plass, Roxana Moreno and Roland Brünken; Part I. Theory: 1. Cognitive load theory: historical development and relation to other theories Roxana Moreno and Babette Park; 2. Cognitive load theory: recent theoretical advances John Sweller; 3. Schema acquisition and sources of cognitive load Slava Kalyuga; 4. Individual differences and cognitive load theory Jan L. Plass and Slava Kalyuga; Part II. Empirical Evidence: 5. Learning from worked-out examples and problem solving Alexander Renkl and Robert K. Atkinson; 6. Instructional control of cognitive load in the design of complex learning environments Liesbeth Kester, Fred Paas and Jeroen J. G. van Merriënboer; 7. Techniques that reduce extraneous cognitive load and manage intrinsic cognitive load during multimedia learning Richard E. Mayer and Roxana Moreno; 8. Techniques that increase generative processing in multimedia learning: open questions for cognitive-load research Roxana Moreno and Richard E. Mayer; Part III. Discussion: 9. Measuring cognitive load Roland Brünken, Tina Seufert and Fred Paas; 10. From neo-behaviorism to neuroscience: perspectives on the origins and future contributions of cognitive load research Richard E. Clark and Vincent P. Clark; 11. Cognitive load in learning with multiple representations Holger Horz and Wolfgang Schnotz; 12. Current issues and open questions in cognitive load research Roland Brünken, Jan L. Plass and Roxana Moreno.