Bounds
All described events are original supplied fiction. No local experiment, child success, measurement, reader hearing ability or annual attainment is supplied.
Child invitation
Name a multi-change limit.
Different child try
Offer a new not-yet-tried pretend job chosen by the child. Child names which information would be needed before a result claim; that new result remains genuinely open.
Materials
Full printed/readable source, blank paper guide and optional exact scribing/AAC; no required device/audio/material purchase.
Next teaching
If all changes counted as fair, use unrelated toy-travel plan: compare rolling on same mat versus rolling different toys on different ramps. Child chooses which answers a mat question then designs a new sound comparison.
Observe
Listen/read/point for the exact source-qualified distinction named in the invitation; record authorship, support and actual/supplied/model mode. A selected label without its meaning does not prove the whole understanding.
Role
ordinary teaching/worked model; never independent held assessment evidence
Teacher moves
List object/action/spot changes so child can see the action-only question is unresolved.
Whole original context source and possible worked
C12 fictional bookshop compares lid/tap near helper with cardboard/shake far away; reports “soft” and “soft”. Possible: “Several things changed, so matching words do not isolate an action effect.”