 This paper aims to investigate whether intervention characteristics and persuasive design affected adherents to web-based health interventions. The authors conducted a systematic review of 101 articles on 83 interventions, coding intervention characteristics, persuasive technology elements, and adherents. They found that primary task support elements are the most commonly employed persuasive technology element, while dialogue support and social support are less commonly used. The study also found significant differences in intended usage, setup, updates, frequency of interaction with the counselor, system, peers, duration, adherents, and the number of primary task support elements between interventions in different healthcare areas. The final regression model explained 55 percent of the variance in adherents, with increased interaction with the counselor, more frequent intended usage, more frequent updates, and more extensive employment of dialogue support significantly predicting better adherents. Overall, this study suggests that using intervention characteristics and persuasive technology elements can help design web-based interventions that are more likely to be adhered to by patients. This article was authored by Kelders, Sesquia M., Koch, Robin N., Osibard, Han Si, and others. We are article.tv, links in the description below.