Based on reviewing the original data that gave rise to the codes as well as the new scenarios contributed by our research group, we have generated the following descriptors or aspects of CUE:

“Strong” examples of CUE:

High cognitive demand

Mathematically correct

Realistic context and/or numbers

Address (or at least don’t add to) misconceptions

Numbers are selected intentionally

Match the purpose of the lesson

“Weak” examples of CUE:

Low cognitive demand

Wrong mathematically

Not realistic context and/or number

Encourage misconceptions

Selected randomly (number selection)

Don’t serve purpose of the lesson

Choice of Examples

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