By the TopicLearn teamExplain-back and diagram-it are two exercise formats TopicLearn can put in a lesson when the topic suits them. In explain-back you say the idea in your own words. In diagram-it you draw how the parts connect. Both make you produce something from memory, which is why they stick better than rereading.
This post covers what each format asks of you, why producing beats reviewing, and how to get the most out of them. For the wider picture of how formats get chosen, see how exercise formats match the subject.
Explain-back: say it like you're teaching it
Explain-back asks you to put a concept into your own words, as if you were explaining it to someone who hasn't seen the lesson. You aren't picking from options. You're building the explanation from scratch.
That is harder than it sounds, and the difficulty is the point. When you reread a paragraph, every sentence feels familiar, so you assume you know it. When you have to explain it, the gaps show up fast: a step you can't connect, a term you can only repeat, not define. The old Feynman technique rests on the same observation.
What a good explain-back sounds like
- It uses plain words. If you catch yourself reaching for the lesson's exact phrasing, you may be reciting, not understanding.
- It includes the why. "Interest compounds" is a fact. "Interest compounds because each period's interest is added to the base for the next period" is an explanation.
- It has a small example of your own, ideally from something you know well.
If you get stuck halfway, that's useful information, not failure. Mark the spot, go back to that section of the lesson, and try again. Our post on learning faster by teaching it goes deeper on why explaining to someone else, real or imagined, works.
Diagram-it: draw the structure
Some ideas are mostly relationships: what feeds into what, what comes before what, which part controls which. A paragraph of text flattens those relationships into a line. Diagram-it asks you to lay them out spatially instead, with boxes, arrows, and labels.
Words and pictures are processed through partly separate channels, and linking the two gives you more than one way back to the memory. That's the core of dual coding theory, also summarized on Wikipedia. A diagram you drew yourself is better than one you only looked at, because choosing what goes in a box and which way an arrow points forces decisions about how the ideas relate.
Topics where diagrams earn their place
- Processes with stages, like how a request moves through a web application.
- Systems with feedback, like supply and demand or the water cycle.
- Anything with hierarchy or categories, like a taxonomy in biology or the layers of a network.
For a topic like a list of dates or vocabulary, a diagram adds little, and that's one reason the format only shows up when it fits.
Why producing beats rereading
Both formats lean on the same mechanism. Pulling information out of your head strengthens it more than putting it in again. The generation effect describes this: material you produce yourself is remembered better than material you only read. Explain-back and diagram-it also show you honestly what you don't know yet, which helps you aim your next study session. That self-awareness is what metacognition is about.
How to use them well
- Do it before you look back. Attempt the explanation or the diagram first, then compare against the lesson.
- Keep it short. Four or five sentences, or one page of boxes. If it sprawls, you're copying, not compressing.
- Fix one gap at a time. Find the weakest spot, reread only that section, and redo that part.
- Come back later. Do the same explain-back a few days on. If it's easy, the idea has settled. If not, you've found what to review.
If you want to see the formats in action, create a lesson on a topic you're learning and look for them where the subject calls for them.
What they aren't
They aren't a test with a score. Think of them as a mirror. A messy first attempt is the expected result, and the second attempt is where the learning shows. If the explanation comes out smooth on the first try, the topic may be too easy for this format, and a harder one is worth picking.