Identify a hidden assumption

Supplied materials

• Paper and pencil, or a browser text area. All named people/events/records are fictional learning inputs.
• Worked case: Excerpt A: A hinge is a movable joint whose distinguishing feature is permitting connected pieces to turn relative to each other. Excerpt B: The writer compares a one-week adult survey with a one-year all-ages survey as if their percentages represented the same population and period. Excerpt C: Jo attached a paper strip between two panels. On the first bend the crease flexed; on the fifth the paper tore. She replaced the strip and wrote the observed limit beside the model. Following this one model shows what the test record contains. Excerpt D: The proposal says the activity is accessible, but accessible may mean merely online or usable by the specified learner.
• Primary check: Excerpt A: A useful boundary: a page can be online but too small to read; this case does not meet our usable-text definition of access. Excerpt B: Recommendation: print the large-text sheet at home; it never checks whether learners have a printer. Excerpt C: An available page is like an open doorway: both offer entry. But a digital page also needs readable content and a usable response method; the physical doorway analogy cannot prove those are present. Excerpt D: Claim: Jo saw Lea with her card. It is unclear whether her names Jo or Lea as the card’s owner.

Learn the idea

An argument may depend on unstated conditions about definitions, comparability, reporting or resources. A sound reading makes those conditions visible rather than silently accepting them.

Trace the stated inference and identify the condition required by the supplied case. Explain what changes if it fails.

Original worked input: Original excerpt B: The writer compares a one-week adult survey with a one-year all-ages survey as if their percentages represented the same population and period. The task is to identify a hidden assumption. The answer is “the samples are comparable”. Evidence: The writer compares a one-week adult survey with a one-year all-ages survey as if their percentages represented the same population and period. Reasoning: the samples are comparable is supported because unlike groups or periods are treated as interchangeable without justification. A requirement on paper does not prove resources exist.

1. Read the supplied worked case and identify the part named in this lesson. An adult can model unfamiliar words.
2. Trace the stated inference and identify the condition required by the supplied case. Explain what changes if it fails.
3. Check the worked solution: the samples are comparable. Evidence: The writer compares a one-week adult survey with a one-year all-ages survey as if their percentages represented the same population and period. Reasoning: the samples are comparable is supported because unlike groups or periods are treated as interchangeable without justification. A requirement on paper does not prove resources exist.
4. Use the new primary and practice cases. Give a reason from the actual words before checking the feedback.

Check your reasoning

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Take it further

Changed-input task: Original excerpt B: The comparison assumes today’s eligibility rules remain the same next year, though that has not been established. Give an evidence-based answer before looking at the model. Expected reasoning: Evidence: The comparison assumes today’s eligibility rules remain the same next year, though that has not been established. Reasoning: criteria will stay constant is supported because the plan relies on a rule remaining unchanged. A requirement on paper does not prove resources exist. Then write a brief alternative sentence, paragraph, source note or scene that demonstrates the same operation; label new fictional details and preserve source limits.

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