# Desk run-through · Year 9 exponent-law continuation

This is an adult simulation and document check, **not a classroom trial, learner outcome, usability study or funder endorsement**. Re-run after any changes and ask actual local users to critique the pack before adoption.

| Perspective | Walk-through | Flaw found and correction | Remaining boundary |
| --- | --- | --- | --- |
| New teacher, Day 13 | Follow [lesson](LESSONS.md#week-3-day-13-a-negative-exponent-is-a-reciprocal), card C and the quotient aid inside 25 minutes; check the metre conversion and exit. | A scale factor could be mistaken for a length. Card C and staff script now name the factor **dimensionless**, the drawing **1 m**, and the result **0.01 m = 1 cm**. | Teacher still checks the local syllabus, reading demands and class pacing. |
| New teacher, Day 16 | Ask for a zero substitution in both product and quotient rather than merely reciting a law. | Original cancellation can hide a removed domain point. Script and key now require the original denominator at `x=0` before cancellation, while distinguishing the product's valid zero substitution. | This sample does not teach every algebraic domain issue. |
| Learner, Day 18 | Take the [table, repair or spoken/tactile route](LEARNER.md#day-18) and evaluate at `n=2`. | `2^(n+2)` could be misread as `2^n+2`. The script and aid now bracket the full exponent and give an independent numeric check. | A single substitution cannot prove the identity. |
| Learner, Days 15/20 | Receive only the day page and fresh card, then see an exact source and a non-leading self-audit. | Practice numbers and check values were separated; assessment and key are staff-held, and learner routes do not link to either file. | Real administration requires a fresh observation and access record. |
| Accessibility | Try the three A4 sheets without colour or print, and give an AAC/tactile/direct-scribe response. | Colour alone was insufficient, so each box has a label and ordered [full text/tactile route](print/TEXT-ALTERNATIVES.md). Domain warning uses words and symbols. | Screen reader/Braille output depends on the user's actual tools; verify locally. |
| Potential funder | Trace every curriculum claim and image right to a row or licence, then ask whether 128 possible strings implies users. | [Crosswalk](CURRICULUM-CROSSWALK.md) says one partial code; source ledger separates ACARA/BIPM/fonts/original work. Tasks and checks explicitly reject a possible-count to real-readership leap. | No efficacy, uptake, national/state accreditation or translation claim is made. |

**Replay receipts:** `python3 verify_pack.py`; `sha256sum -c MANIFEST.sha256`; `pdfinfo`, `pdftotext`, `pdffonts` for each sheet; one-page print visual inspection for clipping and hierarchy. The verifier checks more than file existence, but human review remains necessary for accessibility and teaching judgement.

**Original resource rights:** © NeuroForgeIO Pty Ltd 2026, SubjectNest, [CC BY 4.0](https://creativecommons.org/licenses/by/4.0/). Credit author, source, licence and changes.