“Yesterday, all my troubles seemed so far away.” Greater Emphasis on Within-Person Variability in Research and Practice within Social and Behavioral Sciences

In research, a shift is noticeable from between-person variability and variable-centered approaches to a combination of between- and withinperson variability, thereby integrating a person-centered approach, or even to standalone research on within-person variability. In many domains of social and behavioral sciences within-person (also called intraindividual) variability was largely ignored or even dismissed as simple noise or measurement error variance. This mini-review examines the added value of within-person variability in different domains of human functioning, such as motivation, emotion, executive functioning, memory and sports. Lastly, future developments in research and practice will be discussed.