In one sentence
Fifth-graders learning complex history texts gained more from retrieval practice with feedback to full accuracy than from rereading — while simply lengthening the gap between sessions did not reliably improve scores in this classroom design.
What the researchers did
Franzoi, Cembrani, Mulatti, and Treccani aimed to bridge lab findings and real classrooms. They combined retrieval practice and distributed practice with school-like history texts for 5th graders.
Retrieval was a testing procedure with accuracy feedback until students reached 100% correct on retrieval attempts. Spacing meant lengthening the interval between the first reading of the topic and a later study session. The study compared testing against simple re-reading and manipulated the spacing interval — asking whether both levers help when materials look like real schoolwork.
What they found
- The testing procedure outperformed re-reading for enhancing learning — in line with the broader retrieval-practice literature.
- Manipulating the spacing interval did not yield a significant effect on students’ performance in this setup.
- Authors argue other sustainable classroom approaches to distributed practice may be needed beyond simply stretching one gap.
- Results support spreading evidence-based strategies for text comprehension and long-term retention in primary education.
What this means for learners and educators
- Prioritise quizzing with feedback (to high accuracy) over another silent reread of the chapter — even in primary grades with dense texts.
- Do not assume that one longer wait between two sessions automatically buys a spacing benefit; how you fill sessions (retrieval vs reread) may matter more.
- Build routines that students can finish: feedback loops until mastery are demanding but matched the winning condition here.
- Train teachers on retrieval first; treat spacing schedules as a second design problem that may need multi-session calendars, not a single stretched gap.
Limitations and what we don't know yet
Abstract-level reporting does not give exact sample size, effect sizes, or how long the “long” versus “short” spacing intervals were. A null spacing result in one design does not refute the spacing effect generally — gaps, number of sessions, and retention delay all matter. Mastery-to-100% testing is time-intensive and may not fit every lesson. Generalisation beyond 5th-grade history texts remains open.
FAQ
Should primary teachers drop rereading entirely?
No. Use rereading when comprehension is still broken. Once the text is understood, prefer short retrieval with feedback over another silent pass of the same chapter.
Does a longer gap between two lessons automatically help?
Not in this classroom design. How you fill the sessions (testing with feedback versus rereading) mattered more than simply stretching one interval.
Is mastery-to-100% realistic every day?
It is demanding. Treat it as a target for key checks, not for every exit ticket — and always leave time for feedback.