ATS2946 Chap.2 Support, Fallacies and Assumptions
Support, Fallacies and Assumptions
Deductive Support
Support intended to make the conclusion unavoidable if the premises are true. The useful deductive support move connects this definition to a material fact, explains its mechanism and states the resulting consequence.
In evaluate a workplace proposal that relies on a false choice and an unstated prediction about staff behaviour, deductive support must change the reasoning rather than appear as an isolated label.
Test deductive support against a second concept from Support, Fallacies and Assumptions before concluding.
That comparison exposes the assumptions behind deductive support, separates evidence from inference and prevents a one-sided answer. Record the specific counter-case that would weaken deductive support and the evidence that would justify revision.
Validity
The property of a deductive form in which true premises cannot occur with a false conclusion.
The useful validity move connects this definition to a material fact, explains its mechanism and states the resulting consequence. In evaluate a workplace proposal that relies on a false choice and an unstated prediction about staff behaviour, validity must change the reasoning rather than appear as an isolated label.
Test validity against a second concept from Support, Fallacies and Assumptions before concluding.
That comparison exposes the assumptions behind validity, separates evidence from inference and prevents a one-sided answer. Record the specific counter-case that would weaken validity and the evidence that would justify revision.
Assumption
An unstated proposition needed for the stated reasons to support the conclusion as intended.
The useful assumption move connects this definition to a material fact, explains its mechanism and states the resulting consequence. In evaluate a workplace proposal that relies on a false choice and an unstated prediction about staff behaviour, assumption must change the reasoning rather than appear as an isolated label.
Test assumption against a second concept from Support, Fallacies and Assumptions before concluding.
That comparison exposes the assumptions behind assumption, separates evidence from inference and prevents a one-sided answer. Record the specific counter-case that would weaken assumption and the evidence that would justify revision.
Fallacy
A recurring pattern of defective reasoning whose weakness must be explained in context.
The useful fallacy move connects this definition to a material fact, explains its mechanism and states the resulting consequence. In evaluate a workplace proposal that relies on a false choice and an unstated prediction about staff behaviour, fallacy must change the reasoning rather than appear as an isolated label.
Test fallacy against a second concept from Support, Fallacies and Assumptions before concluding.
That comparison exposes the assumptions behind fallacy, separates evidence from inference and prevents a one-sided answer. Record the specific counter-case that would weaken fallacy and the evidence that would justify revision.
Chapter boundary
Naming a fallacy is not an evaluation; show exactly how the move weakens relevance, acceptability or support.
Use the Support, Fallacies and Assumptions limit as a revision tool: change one condition, reconstruct the reasoning and identify whether definition, evidence, mechanism or implementation caused the recommendation to move.
For a timed Support, Fallacies and Assumptions response, begin with the decision and deductive support.
Apply only facts that change the result, compare a credible validity alternative, and close within the stated boundary. This deductive support sequence makes the reasoning visible without becoming a catalogue of theories.
What this chapter covers
- 01
Deductive support
- 02
Validity
- 03
Assumption
- 04
Fallacy
- 05
Applied decision method
- 06
Boundary and transfer test
Apply deductive support to a changed case
- 1Define deductive support and the decision boundary.
- 1Connect the facts to validity through a stated mechanism.
- 1Compare a credible alternative and identify its trade-off.
- 1Recommend an actor, action and review trigger.
Key terms
- Deductive support
- Support intended to make the conclusion unavoidable if the premises are true. Use it by tying each element to a fact and a consequence in the chapter problem.
- Validity
- The property of a deductive form in which true premises cannot occur with a false conclusion. Use it by tying each element to a fact and a consequence in the chapter problem.
- Assumption
- An unstated proposition needed for the stated reasons to support the conclusion as intended. Use it by tying each element to a fact and a consequence in the chapter problem.
Support, Fallacies and Assumptions FAQ
Where does deductive support enter the argument?
Locate the claim that needs support, then apply this meaning: Support intended to make the conclusion unavoidable if the premises are true. Reconstruct the missing inferential link and test it against this limit before accepting the conclusion: Naming a fallacy is not an evaluation; show exactly how the move weakens relevance, acceptability or support.
Why keep deductive support separate from validity?
Keep the two roles visible. Deductive support supplies one analytical test, while validity means that The property of a deductive form in which true premises cannot occur with a false conclusion. State which premise each concept evaluates and whether either one changes the strength of support.
What would make the assumption support unacceptable?
Reverse the strongest fact in the chapter application—evaluate a workplace proposal that relies on a false choice and an unstated prediction about staff behaviour—and trace the effect through assumption. The judgement should change only when that evidence alters a defined element, the causal link, or the stated boundary.
Can fallacy change the argument's ultimate conclusion?
Use fallacy as a final constraint, not a decorative heading. Its relevant meaning is: A recurring pattern of defective reasoning whose weakness must be explained in context. State the consequence it supports, the uncertainty that remains, and the condition that would require a revised conclusion.
Assessment move
Retrieve deductive support, validity, assumption, fallacy without notes, apply them to a changed version of the chapter case, and repair the first step that violates this limit: Naming a fallacy is not an evaluation; show exactly how the move weakens relevance, acceptability or support.
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