**Original citation**: MD Henderson, Y de Liver, PM Gollwitzer (2008). The effects of an implemental mind-set on attitude strength. Journal of Personality and Social Psychology, 94.3: 396-411. **Target of replication:** The target finding for replication is the difference among three groups (one-sided focus mindset, two-sided focus mindet, and a control group) on measures of attitude ambivalence. **A priori replication criteria:** A successful replication would find that participants in the one-sided focus condition had less ambivalence than participants in the two-sided focus condition. Materials, Data, and Report Study materials are all available under the [Files][1] section. The full report can be downloaded [here][2]. **Conclusions** The target finding for replication was the difference among the three conditions on attitude ambivalence (as indicated by an omnibus ANOVA), and, more specifically, the difference between the one- and two-sided mindset conditions (as indicated by an independent samples t-test). We conducted analyses excluding people who reported direct contact with a sex offender and with the full sample. Regardless of the exclusion criteria, neither of the critical tests was statistically significant. After excluding participants who reported experience with a sex offender, the trend in the data was similar to those reported in Henderson et al. (2008), albeit with a smaller – but still moderate – effect size. These results might suggest that the original report overestimated the size of a real effect . On the other hand, when using the full sample, participants in the one- and two-sided mindset conditions differed only slightly. Such results might suggest the original finding was a false positive. [1]: https://osf.io/79dey/files/ [2]: https://osf.io/project/79dey/node/fkcx9/osfstorage/files/henderson.replication.report.final.pdf/?action=download