Why pulling a word from memory usually beats reading it again
The core comparison is between restudying (reading or reviewing a word and its meaning again) and retrieval practice (trying to produce the meaning from memory before checking). In primary school vocabulary lessons, retrieval practice generally produced better retention than restudying, and this held when the strategies were integrated into ordinary lessons rather than run as lab tasks [1]. A separate primary-school study that pitted pure restudy, elaborative restudy (restudy plus extra meaning-based processing), and retrieval practice against each other found retrieval practice came out ahead of both restudy variants [2].
The intuition is that trying to recall a word forces the learner to reconstruct the link between the foreign word and its meaning, while rereading mostly feels familiar without requiring that reconstruction. That is why retrieval practice is often the better default when the goal is to be able to produce or recognize meanings later.
When restudying holds its own: recognition tests and light retrieval schedules
The advantage is not universal. In classroom experiments on primary-school vocabulary, restudying and retrieval practice did not differ on a multiple-choice test, a result the author flagged as unexpected [4]. Multiple-choice items only require recognizing the right meaning among options, which is a weaker demand than producing it from scratch. When the test is recognition-based, rereading may supply enough familiarity to close the gap.
A second boundary comes from how often retrieval happens. When retrieval practice was limited to twice per item, it was unclear whether retrieval practice would still be effective relative to restudying [5]. In other words, a very light retrieval schedule may not generate enough reconstructive effort to outperform simply reviewing the material.
Does the benefit carry over to school tests and other test formats?
Classroom studies in eighth-grade English vocabulary lessons found that retrieval practice improved learning more than restudying, and that combining retrieval practice with feedback may strengthen memory for information that was not itself retrieved [3]. That feedback point matters for teachers: retrieval without correction can leave errors uncorrected, while retrieval plus feedback appears to extend the benefit.
The transfer question is whether retrieval practice helps on test formats other than the one used in practice. The school-based work on English vocabulary examined retrieval effects across different test formats [3], which is the relevant question for classrooms where the final assessment may be multiple-choice, matching, or production. The primary-school finding that multiple-choice tests showed no restudy-versus-retrieval difference [4] is a reminder that the format of the final test can change which study strategy looks better.
What this means for choosing a study method
For a teacher or learner deciding how to spend vocabulary time, retrieval practice is the better bet when the goal is durable, producible knowledge and when each word gets several retrieval attempts. Restudying is a reasonable choice when the assessment is recognition-based, such as multiple-choice, or when retrieval opportunities are so few that the effortful reconstruction barely happens [4][5]. Combining retrieval with feedback appears to add value beyond retrieval alone [3].
The evidence is strongest for primary-school vocabulary lessons and for eighth-grade English vocabulary, so the conclusions are best read as applying to school-age vocabulary learning rather than to all learners or all subjects [1][3]. Within that scope, the pattern is consistent: retrieval practice usually wins, but restudying is not clearly inferior for recognition tests or very sparse retrieval schedules.
Sources used in this answer
Distributed practice and retrieval practice in primary school vocabulary learning: A multi‐classroom study
In primary school vocabulary lessons, retrieval practice and restudying were compared in a real classroom setting, with retrieval practice generally favored when integrated into lessons.
The benefit of retrieval practice over elaborative restudy in primary school vocabulary learning.
Retrieval practice was more effective than pure restudy and elaborative restudy for primary school vocabulary learning.
Testing and transfer: Retrieval practice effects across test formats in English vocabulary learning in school
In eighth-grade English vocabulary lessons, retrieval practice improved learning more than restudying, and combining retrieval practice with feedback may strengthen memory for non-retrieved information.
Distributed Practice and Retrieval Practice in Primary School Vocabulary Learning
In classroom experiments, restudying and retrieval practice did not differ on a multiple-choice vocabulary test.
Adding the keyword mnemonic to retrieval practice: A potent combination for foreign language vocabulary learning?
When retrieval practice was limited to twice per item, it was unclear whether retrieval practice would be effective relative to restudying.