Samenvatting

Digital Behavior Change Interventions (DBCI) have a pivotal role in reducing lifestyle-related illness, absenteeism, and healthcare costs. Current challenges in designing DBCI are appropriately tailoring interventions and finding new forms of delivery. In this exploratory work, we present the design and evaluation of Tweak, a cloud-based health promotion system that integrates tailored and context-aware health suggestions into the users digital work calendar. Two four-week field studies (N=21) showed how Tweak adapted to changing user profiles and used personal and contextual data to situate suggestions. User insights showed that integration into the calendar stimulated reflective behavior and curiosity and was perceived as easy to use. However, due to differences in calendar use, suggestions could be overlooked. We conclude by discussing implications on how integrated delivery mechanisms can aid the development of future workplace DBCI.