Committing to Keep Clean

Illegal garbage disposals are a persistent urban problem, resulting in high clean-up costs, and nuisance and decreased satisfaction with the neighborhood among residents. We compared three adjacent city-areas in Rotterdam in the Netherlands which, for 2 weeks, either: (1) no action to decrease illegal garbage disposals was taken; (2) standard door-to-door canvassing was carried out; or (3) door-to-door canvassing was enriched with several nudges, most importantly a commitment-nudge. The nudge treatment proved highly effective, reducing illegal disposals at post-test and follow-up (2 months later) with two-thirds, resulting in a very large effect size (d = 2.60). At post-test, standard door-to-door canvassing did not differ from the control treatment, but at follow-up results were comparable to the nudging-treatment. This could, however, be due to spill-over effects. Using a commitment nudge thus proved highly effective in decreasing illegal garbage disposals, however, effects might be specific to neighborhoods with strong social cohesion.</p

When birds of the same feather fly together:The impact of achievement goal compatibility in collaborative learning

In their pursuit of student engagement and achievement, educational institutes have increasingly been implementing student-centred approaches to learning with collaborative learning. In this study, we assessed the (mis)match effects of personal and group members’ achievement goals on student engagement and performance. Students (N = 266) from 36 different groups rated their achievement goals, their group members’ achievement goals, and their engagement for a course. Their exam performance was also included in the analysis. The results of the polynomial regression analyses indicated that both the degree of the compatibility and the direction of the incompatibility in mastery goals related to engagement, while only the degree in incompatibility in mastery goals related to performance. Conversely, neither the compatibility nor the incompatibility in performance goals related to engagement or performance. The results show the importance of examining the interplay between students’ and their group members’ achievement goals for student outcomes in a collaborative learning environment

Nudging is Ineffective When Attitudes Are Unsupportive

For security reasons, employees of a Dutch local government department needed to wear an identifying lanyard with their employee badge, but compliance with this policy was low. Two nudges to increase compliance were evaluated in a pre-registered natural field experiment using a pre-post design, and a qualitative survey. Bayesian inference provides insufficient support for the effectiveness of the nudges. While more respondents judged the nudges and the lanyard policy positively than negatively, there was substantial negative judgment and incomprehension for both with some employees finding the nudges paternalistic. We hypothesize that the nudges were ineffective because they failed to change attitudes about the policy, and because they led to reactance among some employees. Implications for nudging within organizations are discussed.</p