Just-in-Time Adaptive Interventions: Where Are We Now and What Is Next?

The past decade has seen a surge in developing just-in-time adaptive interventions (JITAIs)-an intervention approach that leverages advancements in digital technologies to address the rapidly changing needs of individuals in daily life. This article provides an overview of the state of science on JITAI development and highlights important directions for future research. We explain what a JITAI is (and what it is not) and review the scientific and practical rationales underlying this approach. We also call attention to three key challenges relating to the development of JITAIs. The first challenge is that individuals may not be able to engage with (i.e., invest energy in) an intervention when they need it most in daily life. The second concerns the generally suboptimal engagement of individuals in interventions that leverage digital technologies as currently implemented. The third concerns the paucity of research on ways to harness the power of social relationships in JITAIs. We conclude that much research effort is needed to build more sophisticated and effective JITAIs.