This study was begun as part of the Reproducibility Project: Psychology but was not completed in time to be part of the analysis. **Original citation.** Weidemann, C.T., Huber, D.E., & Shiffrin, R.M. (2008). Prime diagnosticity in short-term repetition priming: Is primed evidence discounted, even when it reliably indicates the correct answer? *Journal of Experimental Psychology: Learning, Memory, and Cognition, 34*(2), 257-281. **Target of replication.** We particularly focus on the significant interaction of prime type and prime duration with the diagnosticity condition, F(6, 228) = 23.42, p < .01. We expected to find that for a given prime duration, a positive prime diagnosticity would increase preference for the primed alternative; but, for that same prime duration, a negative prime diagnosticity would decrease preference for the primed alternative. **A priori replication criteria.** A successful replication would find that for a given prime duration, a positive prime diagnosticity would increase preference for the primed alternative; but, for that same prime duration, a negative prime diagnosticity would decrease preference for the primed alternative. We plan to run a 4 (diagnosticity condition) X 3 (prime type) X 2 (prime duration) mixed effects ANOVA, with diagnostic condition as between subjects and prime type and prime duration as within subjects factors. The effect of interest is the interaction between the three factors. A draft of the replication report with more details can be found [here][1]. [1]: https://docs.google.com/document/d/1zSjSPR1akPN8Hr4mWJ2fjx1UxbIINGzkeArliyzpTY4