**Introduction**
This online repository contains additional data and files accompanying the publication:
Belardi, A., Pedrett, S., Rothen, N., & Reber, T. P. (2021). Spacing, Feedback, and Testing Boost Vocabulary Learning in a Web Application. *Frontiers in Psychology*, 12. https://doi.org/10.3389/fpsyg.2021.757262
A preprint version is available at: https://doi.org/10.31234/osf.io/yqsrx
**Overview of available files**
- Guidelines/Instructions for experimenters (in German)
- Table S1. ANOVA four learning principles, learning direction, and test direction
- Table S2. ANCOVA four learning principles and covariate age
- Table S3. ANCOVA four learning principles and covariate number of trials
- Table S4. ANCOVA four learning principles and covariate motivation (factor failure apprehension (German: Misserfolgsbefürchtung) of the FAM questionnaire)
- Table S5. ANCOVA four learning principles and covariate motivation (factor likelihood of success (German: Erfolgswahrscheinlichkeit) of the FAM questionnaire)
- Table S6. ANOVA four learning principles in subsample (excluding the remote-tested participants)
- Table S7. List of the German and Finnish word pairs used as stimuli in the experiment
- Figure S8. Screenshots of the two types of trials in the web application
- Table S9. Mean numbers of trials per word pair and participant in all conditions
- Table S10. ANOVA learning principles’ effects on frequency of trials differences among stimuli
- Table S11. Power analysis: Required minimal sample sizes for different effect sizes with the 3x2x2x2 mixed ANOVA.
