Interventions to change health-related behaviors often include multiple behavior change techniques (BCTs) that are assumed to interact or have a cumulative effect, with the aim of maximizing the effectiveness of an intervention (Craig et al., 2008; Malotte et al., 2000). Thus far, heterogeneity in the effectiveness of health- related interventions is observed, and it is expected that differences in the techniques used by interventions may account for this heterogeneity. BCTs, such as Prompt intention formation and Provide feedback on performance, can be considered as the atomic parts of an intervention. Interventions may differ greatly in number and type of BCTs. A good theoretical understanding is needed concerning when and how interventions cause changes in health-