Help children choose materials for a particular job, compare suitable samples and explain their choices using observations or information. “Best” means best for the agreed purpose among the examples considered. More than one choice may work.

Begin with a real purpose

Choose one challenge: keep a toy dry, soak up a spill, make a model window, carry a light load, bridge a small gap, consider an outside wall, stir paint or hide a picture. Discuss what the material must do before deciding how to compare it.

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