Goal: describe a square and an oblong rectangle using side/corner clues without enforcing false exclusive categories. Proposed code: AC9MFSP01. Prepare: same-colour square and oblong, equal-length paper strips, Card 103.
- Retrieve · 3 min. Child checks one triangle and one four-sided card by tracing, not size.
- Model · 4 min. Count four straight sides and corners on both cards. Match strips along adjacent sides of the square; all four match on this card.
- Guide · 5 min. Compare the oblong; its long and short adjacent sides differ. Say this is one rectangle example and that a square also has rectangle properties.
- Independent compare · 7 min. Give a rotated square and oblong. Child names or selects both and gives one shared feature plus one useful distinguishing clue.
- Check · 4 min. Ask whether turning the square made a new shape. Have child match sides again rather than rely on orientation.
- Exit · 2 min. Expect “both four straight sides; square has four equal sides on this card.” If only “one is bigger,” revisit strips tomorrow.