Why Shape Detective works

Shape Detective turns a short sequence into practice with reasoning that can be explained from visible clues or rules. Identify a target shape from clues about sides, corners, curves or orientation rather than from its name alone. The child begins by learning how to give one clue about the target shape’s sides or curves, then uses that experience while trying to remove any shapes that cannot fit the clue.

Set up — Give one clue about the target shape’s sides or curves

No special materials are needed before the child is asked to give one clue about the target shape’s sides or curves. Support the child directly if they struggle to give one clue about the target shape’s sides or curves; do not explain the whole sequence before they try to remove any shapes that cannot fit the clue. Use age-appropriate pieces and avoid small loose parts for children who may mouth objects during the opening round.

Step 2 — Remove any shapes that cannot fit the clue

Keep the pace slow while the child tries to remove any shapes that cannot fit the clue. If the effect is hard to see, simplify that action before continuing with the instruction to give a second clue about corners, size or orientation.

Step 3 — Give a second clue about corners, size or orientation

Treat the attempt to give a second clue about corners, size or orientation as a checkpoint between the earlier step to remove any shapes that cannot fit the clue and the coming step to choose the best remaining candidate. A perfect answer is not required.

Step 4 — Choose the best remaining candidate

After completing the instruction to choose the best remaining candidate, pause and ask what changed from the earlier step where they had to give a second clue about corners, size or orientation. Use that answer to decide whether they are ready to reveal the target and verify every clue.

Step 5 — Reveal the target and verify every clue

Keep the adult prompt brief while the child tries to reveal the target and verify every clue. If needed, return to the earlier step to choose the best remaining candidate before asking them to reveal the target and verify every clue.

What to notice before Reveal the target and verify every clue

When the sequence reaches the instruction to choose the best remaining candidate, watch for which clue, position, or relationship supports the answer. If they can connect what happened while trying to give a second clue about corners, size or orientation with the final instruction to reveal the target and verify every clue, the sequence is making sense.

Make Give a second clue about corners, size… easier or harder

Change difficulty one variable at a time around the step where the child must give a second clue about corners, size or orientation. For support, use fewer items and make the relevant difference more obvious; for a stronger round, add one plausible distractor, remove one cue, or ask the child to explain the rule before the child finishes by trying to reveal the target and verify every clue.

Finish after Reveal the target and verify every clue

Reveal the target and verify every clue. Once that result is clear, end the round and leave any harder variation for another time. For another activity, use the activity search or create one with the activity generator.