Ask "why is this true?" rather than just "what is this?"
Generate an explanation for why a fact or concept is true — the self-generated explanation is more memorable than the fact alone.
Why it works
Elaborative interrogation works because it links new information to existing prior knowledge — a process called elaborative encoding. A fact stored in isolation decays rapidly; the same fact integrated into a network of "why" connections becomes retrievable via many pathways. The self-generation of the explanation is important: looking up the answer produces much weaker encoding than struggling to construct it yourself.
How to do it
- When you encounter a fact or concept you want to retain, pause and ask: "Why is this true? What causes this? How does it connect to what I already know?"
- Generate your own explanation before seeking a provided one.
- Write the explanation in one or two sentences — the act of articulating it consolidates it.
- Link the new fact explicitly to two prior things you already know.
Evidence
Dunlosky et al. (2013)’s comprehensive review of study techniques rated elaborative interrogation as one of the higher-utility strategies, supported by multiple experiments showing retention advantages over passive reading. (rct)
The effect is larger when the learner has prior knowledge that the new information can connect to; for truly novel domains with no prior knowledge, elaboration is harder to generate and the benefit is smaller.
Sources
- Dunlosky et al. (2013), Improving students’ learning with effective study techniques, Psychological Science in the Public Interest
Common mistake
Asking "why?" and then immediately looking up the answer, which converts self-generation into passive reading and eliminates the encoding advantage.
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More practices for The Testing Effect: Why Retrieval Practice Beats Restudying
- Free recall immediately after a study session
Close all materials and write everything you remember from the session — without looking.
- Space retrieval attempts across increasing intervals
Test yourself on a topic after a delay, then again after a longer delay — the effort of retrieval at the edge of forgetting makes the memory strongest.
- Use frequent low-stakes quizzes rather than rare high-stakes tests
Regular short quizzes — even without grades — produce more retention than equivalent time spent reviewing.
- Attempt to recall before studying new material
Try to answer questions about material before you’ve studied it — the attempt, even when wrong, enhances retention of the correct answer when it comes.
- Mix topics during retrieval practice rather than blocking by subject
When reviewing material from multiple topics, alternate between them rather than finishing one before moving to the next.
Related concepts
- Active Recall: The Most Effective Way to Study
The testing effect, retrieval practice, and how to build active recall into every session
- The Forgetting Curve: How Memory Decays and How to Fight It
Memory decay, the spacing effect, and how to schedule review so retention compounds rather than collapses
- The Worked Examples Effect: Learn Faster by Studying Solutions First
How to use solved examples, self-explanation, and fading to build skill faster than problem-first practice