Last Lesson, Last Week, Last Month¶

Strategy · All strategies
Evidence · 3 claims (3 for) · 10 studies (5 quant-synthesis, 3 causal, 2 review), q2–q4 · 4 of 10 report an effect size

Description¶

This activity involves looking back to the most important information presented yesterday, last week, and last month. The instructor selects three questions from each time period and asks students to answer them with no assistance, enacting spaced retrieval practice. It signals that learning a topic does not end with the summative assessment and that knowledge builds on knowledge.

Design Implications¶

Retrieval practice strengthens memory more than re-exposure, and its benefits grow when retrievals are spaced across expanding intervals Spaced repetition improves retention. [+S]. The strategy operationalizes this by scheduling retrievals at three fixed lags, forcing learners to reconstruct material just as it begins to fade. Because answers are produced without assistance, the activity also doubles as low-stakes formative assessment that surfaces what has actually been retained Assessment for learning. [+M].

Context¶

Requirements¶

• Careful planning to identify the key information from each time period
• Consistent tracking of content covered, so questions can be drawn from the right intervals
• A no-assistance condition — questions must be answerable from memory, not open-book
• Low-stakes framing with timely feedback, so errors are corrected rather than re-learned Feedback is most effective at task and process levels. [+S]

Constraints¶

• If questions are too easy or cued immediately before the activity, learners retrieve from short-term memory rather than long-term memory, eliminating the spacing benefit Spaced repetition improves retention. [-M]
• Repeated failure on the same questions without corrective feedback can entrench errors and depress self-efficacy
• Poorly chosen questions (trivia rather than core concepts) consume time without reinforcing the knowledge structure
• In fast-paced courses, the "last month" tier may reach material no longer relevant to current goals, creating interference rather than integration

Implementation Variability¶

• Whole-class oral questioning, individual written warm-ups, or low-stakes quizzing tools (e.g., Kahoot!, Socrative, Anki decks)
• Student-generated question banks: learners submit candidate questions after each lesson, and the instructor draws from them
• Cumulative homework or exam items that sample from all three intervals instead of a separate warm-up activity
• Interleaving variant: mix questions across topics within each time tier rather than blocking by topic

Target Learners¶

• All learner levels; particularly effective in secondary and higher education where content is cumulative
• Learners prone to "massed-then-forget" study patterns, who experience the contrast between easy recent recall and effortful distant recall Spaced repetition improves retention. [+M]
• Less suited to learners with severe working memory constraints unless questions are heavily chunked Chunking reduces working memory load. [+M]

Target Learning Goals¶

• Long-term retention of foundational facts, concepts, and procedures
• Cumulative knowledge building: connecting new material to prior units
• Metacognitive calibration — learners directly experience what they have and have not retained

Instructions¶

1. After each lesson, record the key concepts and write two or three answerable questions; keep a running question bank organized by date.
2. At the start of class, present three questions each from yesterday, last week, and last month.
3. Have students answer with no assistance — individually in writing, or via a low-stakes quiz or response system (see Assessment).
4. Reveal answers and provide brief corrective feedback, linking each item to the current lesson where possible.
5. Periodically return to items students missed, adjusting the intervals for material that has not yet stabilized.

Related Strategies¶

• Spaced retrieval and cumulative review — this strategy is a classroom implementation of the spacing effect
• Exit tickets and warm-up quizzes — related short-cycle formative routines that feed the question bank
• Implement weekly low-stakes spaced recall quizzes cycling fundamental concepts monthly, with a plan to address student frustration

Examples¶

• A high school biology teacher opens each class with three questions on the board — one from the previous lesson, one from the unit started last week, one from a unit completed last month — answered in the first five minutes on index cards.
• A university statistics course uses weekly low-stakes online quizzes in the LMS that automatically sample items from all prior weeks, with item difficulty adapted to prior performance.
• Language courses using Anki or Quizlet implement the same logic digitally, with spaced-repetition algorithms replacing the fixed three-interval schedule.

Key Sources¶

• Roediger, H. L., & Karpicke, J. D. (2006). Test-enhanced learning: Taking memory tests improves long-term retention. Psychological Science, 17(3), 249–255. doi:10.1111/j.1467-9280.2006.01693.x
• Cepeda, N. J., Pashler, H., Vul, E., Wixted, J. T., & Rohrer, D. (2006). Distributed practice in verbal recall tasks: A review and quantitative synthesis. Psychological Bulletin, 132(3), 354–380. doi:10.1037/0033-2909.132.3.354
• Dunlosky, J., Rawson, K. A., Marsh, E. J., Nathan, M. J., & Willingham, D. T. (2013). Improving students' learning with effective learning techniques. Psychological Science in the Public Interest, 14(1), 4–58. doi:10.1177/1529100612453266
• Agarwal, P. K., & Bain, P. M. (2019). Powerful teaching: Unleash the science of learning. Jossey-Bass.