Biggs and Sutton (1983, p. 16) describe sorting as "looking at a set of objects and deciding how the objects are with similar qualities (or the same) and how they are different."
"At an early stage the ability to discriminate attributes, by sorting, helps children to sort objects into subsets, to match these one-to-one and subsequently to count and calculate.
At a later stage, this process of selection helps children to select variables (attributes in many different situations, including some in algebra and geometry; for example, an algebraic description of odd numbers, squareness, etc.)" (Biggs & Sutton 1983, 16).
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| Sorting the objects according to the attribute. |
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