Spot irrelevant and missing reasons
See this course’s project requirements
An argument-audit packet with a premise map, conditional tests, counterexamples, repaired reasoning, certainty labels, and a final evidence-based room recommendation.
Keep your working files in your own notebook or software. Save a private description, checklist, and work link in My Proof.
What to include
- Identify premises, conclusion, and assumptions.
- Test conditional direction and create valid counterexamples.
- Explain and repair irrelevant or incomplete reasons.
- Distinguish rule-based conclusions from uncertain predictions.
- Produce the final map with a clear change trigger.
Review and revise
Use these criteria to check your work and choose what to improve.
- Argument roles are correctly identified.
- Counterexamples have the required true-condition/false-result structure.
- Revisions address the actual evidence gap.
- Final conclusions follow the supplied facts without hidden assumptions.
Want more background?
The idea in everyday life
Three fictional club comments: A “Reject Room B because the proposer dresses badly.” B “We must choose A or cancel,” although B is available. C “Use B because 1,000 people liked its photo.” The workshop needs 20 seats and access for all participants. Room B has 24 seats; its access remains unverified.
Name the missing support rather than using a fallacy label as an insult.
Spot irrelevant and missing reasons: guided practice
Name the missing support rather than using a fallacy label as an insult.
Use paper or a free local text editor. This is an original fictional practice case; do not submit its records to a real service. Start this lesson with these facts, even if an earlier variation changed them. Three fictional club comments: A “Reject Room B because the proposer dresses badly.” B “We must choose A or cancel,” although B is available. C “Use B because 1,000 people liked its photo.” The workshop needs 20 seats and access for all participants. Room B has 24 seats; its access remains unverified.
1. Check relevance
Compare A’s clothing criticism with the room requirements.
You should see: Clothing supplies no evidence about room suitability.
Personal criticism can distract from the decision’s actual criteria.
2. Check the choices
Compare B’s either/or statement with available Room B.
You should see: The choice omits an available alternative; it is a false dilemma.
An incomplete option list can make a weak choice seem unavoidable.
3. Check popularity
Compare likes with seating and access evidence.
You should see: Popularity does not establish capacity or accessibility.
Approval can be relevant to preferences but cannot substitute for technical facts.
4. Repair one comment
Replace C with a criterion-based reason using known capacity.
You should see: Room B seats 24 and our group has 20; verify access before choosing.
Repairing the support is more useful than merely naming the error.
What to finish
Spot irrelevant and missing reasons record with the worked decisions and changed-case check.
Watch for this
Using fallacy names to attack a person or to avoid evaluating other evidence.
How can I tell I understand it?
Identify why a persuasive sentence fails to support its conclusion. Explain the evidence behind the result and correct any mismatch.
Quick knowledge check
Answer all 3 questions. Get at least 2 right and the lesson completes automatically.
You’ll get an explanation for each answer. Signed in? Your results save to your account.
Pass the check. We’ll save the progress.
Answer all 3 questions above and get at least 2 right. You can review the explanations and try again.
Go to the knowledge checkOptional course overview video · same video as Lesson 1
How to Argue - Philosophical Reasoning: Crash Course Philosophy #2
From CrashCourse. Watch here or open it on YouTube .
Optional course overview. Follow the written steps below at your own pace.Tools, templates, and lesson sources
Tools and templates
Tools open in a new tab so you can keep your place here.
Sources and further reading
Explore the references behind this lesson.
Source & access notes · checked 2026-09-12
Inspected relevance, false dilemmas, weak evidence, and unwarranted assumptions.
Access: Public page or PDF inspected without payment or institutional sign-in on September 12, 2026. Optional external accounts are unnecessary for this course.
Reuse: Link and original paraphrase only. Public access does not grant blanket reuse; no provider text, figures, or exercises are reproduced.
Report a problem with this lesson
Tell us what went wrong. Please leave out personal information and private project contents.