Evidence

These decisions weren't guesses.

Spaced review follows the FSRS schedule, wrong answers rely on retrieval practice, and “you know it when you can teach it” comes from learning by teaching. Below is the research we actually built on. Click a title to read it.

Why this page exists: We say things like “review on a scientific schedule” and “you know it when you can explain it.” Claims like that need sources. This page is the sources themselves, not decoration at the bottom of a page.
How they were checked: 18 of the 21 have a DOI, and every one was verified against CrossRef: titles and years match. Click a title to open the original. The other three are books (Vygotsky 1978, Erikson 1950, Dweck 2006) and never had DOIs. We are not inventing one.
What we deliberately don't do: You won't find citation badges next to product features. Live captions, OCR, PPTX export are engineering; they have no psychology source, and pinning one on would be fake rigor. Every paper here backs a learning practice, nothing else.

The method: where SOAR comes from

Learning strategies that help students SOAR to success. Kiewra, K. A., & Luo, L. (2020) · Oxford Research Encyclopedia of Education
An investigation of SOAR study strategies for learning from multiple online resources. Daher, T. A., & Kiewra, K. A. (2016) · Contemporary Educational Psychology, 46, 10–21
Concept mapping: A useful tool for science education. Novak, J. D. (1990) · Journal of Research in Science Teaching, 27(10), 937–949
Becoming a self-regulated learner: An overview. Zimmerman, B. J. (2002) · Theory Into Practice, 41(2), 64–70

Review and memory

Distributed practice in verbal recall tasks: A review and quantitative synthesis. Cepeda, N. J., Pashler, H., Vul, E., Wixted, J. T., & Rohrer, D. (2006) · Psychological Bulletin, 132(3), 354–380
Test-enhanced learning: Taking memory tests improves long-term retention. Roediger, H. L., & Karpicke, J. D. (2006) · Psychological Science, 17(3), 249–255
Retrieval practice produces more learning than elaborative studying with concept mapping. Karpicke, J. D., & Blunt, J. R. (2011) · Science, 331(6018), 772–775
Improving students' learning with effective learning techniques. Dunlosky, J., Rawson, K. A., Marsh, E. J., Nathan, M. J., & Willingham, D. T. (2013) · Psychological Science in the Public Interest, 14(1), 4–58
The relative benefits of learning by teaching and teaching expectancy. Fiorella, L., & Mayer, R. E. (2013) · Contemporary Educational Psychology, 38(4), 281–288

Classroom and interaction

Active learning increases student performance in science, engineering, and mathematics. Freeman, S., Eddy, S. L., McDonough, M., et al. (2014) · PNAS, 111(23), 8410–8415
The ICAP framework: Linking cognitive engagement to active learning outcomes. Chi, M. T. H., & Wylie, R. (2014) · Educational Psychologist, 49(4), 219–243
Mind in Society: The Development of Higher Psychological Processes. Vygotsky, L. S. (1978) · Harvard University Press

One-to-one tutoring: why the assistant works this way

The 2 sigma problem: The search for methods of group instruction as effective as one-to-one tutoring. Bloom, B. S. (1984) · Educational Researcher, 13(6), 4–16
The role of tutoring in problem solving. Wood, D., Bruner, J. S., & Ross, G. (1976) · Journal of Child Psychology and Psychiatry, 17(2), 89–100

Motivation and emotion: where the restraint comes from

Building a practically useful theory of goal setting and task motivation: A 35-year odyssey. Locke, E. A., & Latham, G. P. (2002) · American Psychologist, 57(9), 705–717
The control-value theory of achievement emotions. Pekrun, R. (2006) · Educational Psychology Review, 18(4), 315–341
Self-determination theory and the facilitation of intrinsic motivation, social development, and well-being. Ryan, R. M., & Deci, E. L. (2000) · American Psychologist, 55(1), 68–78

How growth happens

Theoretical propositions of life-span developmental psychology: On the dynamics between growth and decline. Baltes, P. B. (1987) · Developmental Psychology, 23(5), 611–626
The role of deliberate practice in the acquisition of expert performance. Ericsson, K. A., Krampe, R. T., & Tesch-Römer, C. (1993) · Psychological Review, 100(3), 363–406
Childhood and Society. Erikson, E. H. (1950) · W. W. Norton & Company
Mindset: The New Psychology of Success. Dweck, C. S. (2006) · Random House

21 papers · every DOI checked.