Abstract
In this study we analyze studies published since 1990 which tested task performance in a single and multitasking environment where at least one of the tasks was a media use task; we identify theoretical approaches, conceptual, and operational definitions of multitasking research; we critique definitions of successful multitasking; and we analyze published results in terms of task-related complexity and cognitive and perceptual system overlaps. We conclude that complexity and overlaps appear to be important variables underlying multitasking research results and provide recommendations for future research in the area.