--- title: "Why every lesson ends with a quiz · vuejs.school" description: "Recalling an idea strengthens memory more than rereading it. Here is why each lesson ends with three questions, how they are picked, and what a wrong answer does." canonical_url: "https://vuejs.school/community/blog/why-every-lesson-ends-with-a-quiz" meta: "og:description": "Recalling an idea strengthens memory more than rereading it. Here is why each lesson ends with three questions, how they are picked, and what a wrong answer does." "og:image": "https://vuejs.school/_og/d/a_~V2h5IGV2ZXJ5IGxlc3NvbiBlbmRzIHdpdGggYSBxdWl6IMK3IHZ1ZWpzLnNjaG9vbA%2Cc_OgCard.takumi%2Ctitle_Why%2Bevery%2Blesson%2Bends%2Bwith%2Ba%2Bquiz%2Cdescription_~UmVjYWxsaW5nIGFuIGlkZWEgc3RyZW5ndGhlbnMgbWVtb3J5IG1vcmUgdGhhbiByZXJlYWRpbmcgaXQuIEhlcmUgaXMgd2h5IGVhY2ggbGVzc29uIGVuZHMgd2l0aCB0aHJlZSBxdWVzdGlvbnMsIGhvdyB0aGV5IGFyZSBwaWNrZWQsIGFuZCB3aGF0IGEgd3JvbmcgYW5zd2VyIGRvZXMu%2Ceyebrow_~QmVoaW5kIHRoZSBzY2VuZXMgwrcgNyBtaW4gcmVhZA%2Ctint_sand%2Cp_Ii9jb21tdW5pdHkvYmxvZy93aHktZXZlcnktbGVzc29uLWVuZHMtd2l0aC1hLXF1aXoi%2Cs_faEDYD4cZoeg49oH.png" "og:image:alt": "Why every lesson ends with a quiz · vuejs.school" "og:image:height": "600" "og:image:type": image/png "og:image:width": "1200" "og:title": "Why every lesson ends with a quiz · vuejs.school" "twitter:image": "https://vuejs.school/_og/d/a_~V2h5IGV2ZXJ5IGxlc3NvbiBlbmRzIHdpdGggYSBxdWl6IMK3IHZ1ZWpzLnNjaG9vbA%2Cc_OgCard.takumi%2Ctitle_Why%2Bevery%2Blesson%2Bends%2Bwith%2Ba%2Bquiz%2Cdescription_~UmVjYWxsaW5nIGFuIGlkZWEgc3RyZW5ndGhlbnMgbWVtb3J5IG1vcmUgdGhhbiByZXJlYWRpbmcgaXQuIEhlcmUgaXMgd2h5IGVhY2ggbGVzc29uIGVuZHMgd2l0aCB0aHJlZSBxdWVzdGlvbnMsIGhvdyB0aGV5IGFyZSBwaWNrZWQsIGFuZCB3aGF0IGEgd3JvbmcgYW5zd2VyIGRvZXMu%2Ceyebrow_~QmVoaW5kIHRoZSBzY2VuZXMgwrcgNyBtaW4gcmVhZA%2Ctint_sand%2Cp_Ii9jb21tdW5pdHkvYmxvZy93aHktZXZlcnktbGVzc29uLWVuZHMtd2l0aC1hLXF1aXoi%2Cs_faEDYD4cZoeg49oH.png" "twitter:image:alt": "Why every lesson ends with a quiz · vuejs.school" --- > Index of every page on this site: [llms.txt](https://vuejs.school/llms.txt) ## Recall beats rereading Reading an explanation twice feels like learning. The second time through, every sentence is familiar, and familiarity feels like knowing. It is not the same thing. Familiarity means you recognise the idea when you see it. Knowing means you can produce it when the page is not in front of you, which is the situation you are in when you write code. The research term for this is the testing effect: pulling a fact out of memory strengthens that memory more than putting the fact in again by rereading. In [a 2006 study](https://pubmed.ncbi.nlm.nih.gov/16507066/), students who took recall tests on a passage remembered more of it two days and a week later than students who reread it, even though rereading made them feel more confident. Tested five minutes later, the rereaders did better, so rereading can look like the better method at the time. The effort of retrieval is the point. A question that makes you work out which option is right does more for you than a paragraph that tells you, even when you get it wrong, as long as you see the right answer straight after. The quiz always shows it. In [a 2009 study](https://pubmed.ncbi.nlm.nih.gov/19586265/), people who tried to answer before being shown the answer learned more than people who read the question and answer together. A quiz does a second job too. It tells you what you do not know. After a lesson on slots you may feel you understood scoped slots. A question that asks how the parent reads a value the child passed will tell you, in ten seconds, whether that feeling was accurate. ## Why three questions and not ten Lessons on the school are short on purpose: one idea, a few minutes of reading. A ten-question quiz would turn a short lesson into a long one. It would also turn the quiz into a hurdle, something to get through, and people skip hurdles. Three questions take about a minute. That is short enough to do every time, and doing it every time matters more than any single quiz being thorough. Three also gives a pass mark that forgives one slip: two right finishes the lesson. The wrong answer still gets recorded, so that question comes back later. Miss two and you can ask for a new set of questions straight away. ## How the three questions are picked The three are not drawn at random. Two come from the lesson you just read, in this order of priority: 1. Questions you missed before. 2. Questions you have never seen. 3. Questions you have already answered correctly. Within each group the easier questions come first. Once you are doing well on a track, with more than sixty percent of your answers right across its lessons, that flips and the harder questions come first. The third question comes from an earlier lesson that this one builds on, usually the one just before it. If one of those earlier lessons needs review (more on that below), the question comes from that one instead. This keeps earlier material alive while you move forward. The very first lesson, with nothing before it, takes all three from its own questions. Each question carries a one-line reason, such as "New for you", "Missed last time" or "Checks a prerequisite", so the choice is never a mystery. ## How a question is written Every question tests one idea. The prompt describes a concrete situation, often with a few lines of code, rather than asking you to define a term. "What is a scoped slot?" is a definition. "A list component renders ``. How does the parent read `item`?" is a situation, and it is the one the school asks. The wrong options are the part that takes longest to write. A wrong option is only useful when it is something a real person would believe. Options that nobody would choose are padding, and they make the right answer easy to guess by elimination. In the scoped slot question above, the right answer is `