Where Do the Stairs Go?
Every little kid asks it; the mentor explainer answers it — where escalator stairs go (nowhere: you've ridden the same forty stairs your whole life). Students map the explainer's four moves — the question-hook, the ONE needed idea, the follow-one-stair mechanism, the wonder handed back — then draft their own explainer on something they can actually explain.
Common Core standards covered
- W.6.2Write informative/explanatory texts to examine a topic and convey ideas, concepts, and information through the selection, organization, and analysis of relevant content.
- W.6.10Write routinely over extended time frames (time for research, reflection, and revision) and shorter time frames (a single sitting or a day or two) for a range of discipline-specific tasks, purposes, and audiences.
© Copyright 2010. National Governors Association Center for Best Practices and Council of Chief State School Officers. All rights reserved.
Teacher-facing overview
Big idea: Write informative/explanatory texts that examine a topic and convey ideas through well-chosen facts, definitions, and details — with a clear introduction, organized development, precise language, and a conclusion that follows; write routinely in shorter time frames.
Student target: “I can write an explainer using the four moves — a question-hook, the one needed idea with a comparison, a follow-one-thing mechanism, and a wonder-ending — with precise words and real details.”
Success criteria: I can map the mentor's four moves with citations. · I can write a question-hook with one bait-fact. · I can name my topic's ONE needed idea and give it a comparison. · I can teach my mechanism by following one thing through it.
Essential question
The mentor takes a machine everyone rides and nobody understands, and explains it so well the ending gives the mystery BACK — solved, and still amazing. What are the moves, and what's the one idea YOUR topic needs?
Learning target: I can write an explainer using the four moves — a question-hook, the one needed idea with a comparison, a follow-one-thing mechanism, and a wonder-ending — with precise words and real details.
Success criteria
- I can map the mentor's four moves with citations.
- I can write a question-hook with one bait-fact.
- I can name my topic's ONE needed idea and give it a comparison.
- I can teach my mechanism by following one thing through it.
Why this matters
W.6.2 asks for topics examined through well-chosen facts, definitions, and details — and the danger at Grade 6 is the encyclopedia dump: everything known, nothing organized. The mentor models the cure: ONE question hooks, ONE idea founds, ONE followed stair organizes the whole mechanism, and the ending hands the wonder back. The follow-one-thing trick is the most transferable move in explanatory writing — one water drop through the water cycle, one bill through Congress, one red blood cell around the body — because following converts systems into stories, and stories organize themselves. W.6.10's shorter-time-frames clause is honored the only way it can be: drafting today, inside the hour.
Students should already be able to
- Paragraph basics.
- A topic the student genuinely understands (brainstormed).
- Nothing else — the mentor carries the method.
Where this shows up outside the classroom
Assessment plan
Formative — for feedback during the lesson
- Warm-up — owned topics banked.
- Map check — four moves cited.
- Draft circulation — the dump interrupted, travelers found.
Summative — the graded evidence: Exit ticket (moves + hook + the trick) plus the draft and partner test; the handrail mini and the video audit rank as extension evidence.
The passage: “Where Do the Stairs Go? — mentor text”
An original explainer written for this lesson (≈450 words). The escalator mechanism — the loop, the two-rail flattening, the comb-plates — is real engineering.
¶1 Stand at the bottom of an escalator and watch the stairs vanish into the floor. Now the question every little kid asks and every adult has stopped asking: where do they GO? The stairs slide under a metal comb-plate and disappear, and new ones keep rising at the top like the building has an endless supply. It doesn't. You have been riding the same thirty or forty stairs your whole life.
¶2 To see how, you need one idea: the escalator is a LOOP — a giant flattened circle, like a bicycle chain standing on its side. Every stair is clamped to that hidden chain. The part you ride on is just the top half of the circle. The bottom half is there too — you've simply never seen it, because it runs beneath your feet, inside the machine.
🔒 The full text — 5 numbered paragraphs, plus the photocopy-ready handout — ships in the kit. See plans →
The task students work on
The class maps the mentor's four moves, names the precision kit (comb-plate, two rails, forty times a minute), then drafts: a topic they truly know, a question-hook with bait-fact, the ONE needed idea with a comparison, and the mechanism taught by following one thing through it. The wonder-ending is drafted last or assigned as the homework finish. Partners test: can you find my four moves?
The four-move map — mentor first, your draft second.
| Move | Where the mentor does it (¶) | How it works there | Your draft's version |
|---|---|---|---|
| 1 — The question-hook + bait-fact | |||
| 2 — The one needed idea + comparison | |||
| 3 — Follow one thing through the mechanism | |||
| 4 — Hand back the wonder |
Anticipated student strategies
Mapping first for the frame. The dump interrupted by the follow-one-thing question. One-idea hunting gets the most support — it's where explainers are won.
- Move mapping. The student locates the four moves before drafting.
The established mentor-text habit. Fast here — the moves are one-per-paragraph by design.
🔒 2 more anticipated strategies with select-and-sequence guidance are in the full lesson. See plans →
Lesson script
Collect a sampler on the board — the room always has surprising expertise. Rule: the topic must be something they genuinely understand (the mentor's escalator was researched; theirs shouldn't need to be — W.6.10's short-time-frame drafting depends on owned knowledge). Tease the mentor: an everyday machine, a question everyone stopped asking, and an answer that gives the wonder back.
Listen for: You can't organize knowledge you don't have — today is about the MOVES, and owned topics let the moves get all the attention.
The mentor is in the workbook and handout. Build the map (one move per ¶, plus ¶4's flagged clever part). Then the precision collection: comb-plate, U-turn, two rails, forty times a minute, hundreds of laps — ask what the paragraph loses if 'comb-plate' becomes 'that metal thing' (precision is how explainers earn trust). Land the central trick by name: FOLLOW ONE THING — one stair's day taught the whole machine, because following converts a system into a story.
- Four moves, one per paragraph.
- The precision kit: exact words and real numbers, collected.
Listen for: One idea, planted alone, is learnable; three ideas at once are noise. The discipline of ¶2 is what makes ¶3 easy — foundations are single.
🔒 The remaining 4 steps — fully scripted with teacher-says lines, discourse questions, look-fors, and interventions — are in the full lesson. See plans →
Misconceptions and how to respond
- “An explainer should include everything I know about the topic.” The mentor knows more about escalators than it says — no motors, no safety brakes, no history. It chose ONE question and answered it completely. Explainers are built by selection; dumps are built by emptying. Choose the question first.
- “Comparisons are babyish — real explanations use technical terms.” — the teacher response is in the full lesson.
- “Endings should summarize the main points.” — the teacher response is in the full lesson.
- “I need to research my topic first.” — the teacher response is in the full lesson.
🔒 Every misconception ships with a tested classroom response. See plans →
Scaffolded practice
The workbook follows gradual release rather than a page of blank prompts: 2 fully worked, 2 partially completed, then 4 independent.
- I doLiteral first — the mechanism. Explain where escalator stairs go, using the loop idea and two precise details.
🔒 7 more prompts across all three release tiers are in the full lesson. See plans →
Worked solutions and scaffolds for every prompt are in the downloadable kit, included with membership. See plans and pricing.
Exit ticket
- The four moves, with ¶s.
🔒 2 more exit-ticket questions are in the full lesson. See plans →
Worked answers, the completed answer tables, and the scoring rubric are in the downloadable kit, included with membership. See plans and pricing.
Printable handouts in the kit
All handouts are in Printable_Handouts.pdf inside the kit download.
Materials and classroom resources
Student experience
Students enter through a low-floor prompt, build or sketch a model, test a strategy, revise their thinking, collaborate, and present a final solution. The task remains accessible while allowing for sophisticated reasoning.
Detailed facilitation notes
- Step 1: Read the mentor; feel the mystery get answered. Ask: “What do you notice?”, “What could you try next?”, and “How can you prove that?”
- Step 2: Map the four moves: the question-hook, the one idea, follow-one-stair, the hand-back. Ask: “What do you notice?”, “What could you try next?”, and “How can you prove that?”
- Step 3: Choose your topic; find YOUR one needed idea. Ask: “What do you notice?”, “What could you try next?”, and “How can you prove that?”
- Step 4: Draft: hook, idea, mechanism — with the follow-one-thing trick. Ask: “What do you notice?”, “What could you try next?”, and “How can you prove that?”
Differentiation and inclusion
Support: The follow-one-thing trick structures any mechanism; extend with the flattening paragraph study and the wonder-ending analysis.
Language support: “I started by…”, “My model shows…”, and “I know my answer is reasonable because…”.
Extension: Require a second solution, alter a condition, or have students write a challenge for another group.
Accessibility: Manipulatives, enlarged visuals, oral response choices, partner reading, and reduced-copy student pages.
Assessment plan
Formative checks: Strategy choice, accuracy, representation, collaboration, and explanation.
End evidence: The mentor's four moves mapped with citations, plus a drafted opening: question-hook and the one-idea paragraph.
Mastery: The student completes the task accurately and explains the strategy with limited prompting.