Target: preserve the identities/key while representing a later supplied record; partial AC9TDIFK02. Ready: A/C, two snapshots, guide key.
- Welcome · 3 min. “Two records can tell us different things. Let's see what changed.” These are invented snapshots, not observed classroom movement.
- Model · 4 min. Read A and C with both source/time labels. BOOK changes LEFT to RIGHT; BOX changes RIGHT to LEFT; CLOTH stays MIDDLE. No reason for the change is supplied.
- Together · 5 min. Compare each item entry rather than guessing from a whole page. The circle still means BOOK; a changed location does not automatically change its meaning.
- Child task · 7 min. Child builds or directs C in object/picture/symbol forms, keeps A labelled separately, and identifies what stays and changes. If using actual objects to enact C, label that enactment; it is not an observation of the invented earlier event.
- Notice · 4 min. Save first item/position comparisons and key use. If every entry is changed, isolate CLOTH's two rows, then return to all three without giving the child's answer.
- Close · 2 min. “We can keep a useful old record and add a later one.” Different records need clear labels.