lesson
Choose useful yes-or-no questions
1 · Learn
An attribute is a property of an item, such as its shape or colour. A branching database uses questions to narrow a group until an item can be identified.
Use questions with clear answers for the actual set. 'Is it lovely?' is an opinion, not a reliable property. 'Does it have three straight sides?' can separate triangles from other shapes.
2 · Worked example
My set has a triangle, square and circle. Asking whether a shape has straight sides separates the circle from the two polygons.
3 · Your turn
For a triangle, square and circle, is 'Is it nice?' a useful shared sorting rule? Suggest a clearer question.
Check your answer
No: people may disagree. 'Does it have three sides?' or 'Does it have straight sides?' gives a clearer rule for this set.
4 · Apply your learning
Sort safe paper shapes by a visible attribute. Record the question and check that every item fits one branch.
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