Several authors have provided comprehensive reviews and even a meta- analysis on behavioral spillover effects and suggested frameworks to understand and explain different types of spillover (see Dolan & Galizzi, 2015; Maki et al., 2019; Nilsson et al., 2017; Truelove et al., 2014). Therein, a number of moderators and psychological processes have been suggested to account for spillover processes to happen. Based on these elaborate approaches to understand spillover, two distin guishable– even though not exclusive– lines of understanding and implicit definitions of spillover can be found. The first line defines spillover effects in environmental issues as the influence of one beha vior on the probability of another behavior (e.g., Nilsson et al., 2017), which can be seen as a sequential process. Proponents of the other line of understanding do not see behavior performance as the cause for spillover, but as an effect of an intervention on behaviors not specifi cally targeted by an intervention (e.g., Dolan & Galizzi, 2015; Truelove et al., 2014). Thus, this understanding implies an underlying third construct (e.g., knowledge or personal characteristics) that is affected by an intervention and itself affects not just the target behavior but other behaviors as well. Even though these two lines of understanding differ in the way they define spillover, explanations might be similar to account for spillover effects.