Build the Argument Map
In the first two lessons, you learned to control your attention, reconstruct what is actually present, and recognize when someone else has chosen the target for you. Now you will make the reasoning itself visible.
How to Work Through This Lesson
Lesson 3 builds directly on reconstruction. Instead of simply locating claims and evidence, you will learn to expose the connections between them and determine where an argument actually succeeds or fails.
Start at the Destination
Identify what the author ultimately wants you to conclude before collecting supporting statements.
Expose the Connections
Do not merely list claims and evidence. Ask how each piece is supposed to support the next step in the reasoning.
Test the Structure
Locate evidence failures, inference failures, assumptions, and conclusions that travel farther than the evidence permits.
Lesson 3 · Block 1
The Pile Is Not the Argument
Facts do not arrange themselves into conclusions
Begin Lesson ↓
Is this an argument?
Read the five statements below as a group.
The first four statements may all be completely true.
But truth alone does not automatically transform them into support for the conclusion:
Something has to explain why those facts justify that conclusion.
For example, the missing reasoning might involve claims about privacy, government authority, proportionality, available alternatives, or the significance of collecting location data.
Until those connections are supplied, we do not yet know how the argument gets from the evidence to the policy conclusion.
An argument is not merely a collection of statements.
It is a structure in which some propositions are offered as reasons for accepting other propositions.
That hidden structure is what Lesson 3 will teach you to make visible.
Lesson 3 · Block 2
What Is an Argument Map?
Make the reasoning structure visible
Open Block ↓
An argument has architecture.
Block 1 exposed the problem: facts do not arrange themselves into arguments.
Something must connect the evidence to the claims and the claims to the conclusion.
A simple argument might look like this:
It is meant to make the reasoning visible enough that you can inspect every connection.
Real arguments often have more than one branch.
Several different lines of support may converge on the same conclusion.
Claim A
Claim B
Claim C
Assumptions may also sit underneath any of these connections.
That is important because an argument can appear complete while depending upon something that was never expressly established.
What is the primary purpose of an argument map?
Lesson 3 · Block 3
Start at the Finish
What does the author want me to conclude?
Open Block ↓
Do not start by collecting interesting statements.
When students first try to map an argument, they often begin by underlining facts, quotations, or sentences that seem important.
That can leave them with another pile.
Put that proposition at the top of the map.
Then work backward.
Automated license-plate cameras collect location information concerning large numbers of vehicles, including vehicles whose owners are not suspected of crimes.
When records from multiple locations are retained and searched, they can reveal patterns concerning a person’s movements.
Law-enforcement agencies can investigate vehicle theft and other crimes using less comprehensive investigative methods.
The city should therefore prohibit the use of automated license-plate cameras.
Now make the destination explicit.
Notice that this is not merely the topic.
“License-plate cameras” would identify the subject.
The conclusion identifies the proposition the author wants accepted.
In this example, the argument would need to establish at least several supporting claims.
We have not yet established whether any of those claims are true.
We have simply identified what the argument would need in order to carry the reader to its conclusion.
Reading forward asks: “What statements appear in the text?”
Mapping backward asks: “What must this argument establish to reach its destination?”
Lesson 3 · Block 4
Building the Map Backward
Evidence → Inference → Assumption → Claim
Open Block ↓
Take one claim from the map.
In Block 3, we identified this as one of the propositions the argument would need to establish:
Now ask:
The argument might offer facts such as:
Suppose all four facts are true.
Are we finished?
Evidence does not interpret itself.
The argument needs a reasoning step connecting the facts to the privacy claim.
That is the intellectual bridge between:
When that happens, the disagreement may be located in the inference, not in the facts themselves.
But there is still something underneath this reasoning.
What has to be true for the inference to work?
The reasoning depends upon a further proposition that may not have been expressly argued.
Whether that proposition is ultimately correct is a later question.
Right now, the mapping task is simply to make it visible.
You have not decided whether the cameras are constitutional.
You have not decided whether the privacy claim is correct.
You have not decided whether the city should prohibit the technology.
You have made the reasoning visible.
Lesson 3 · Block 5
The Four Kinds of Failure
Evidence · Inference · Assumption · Scope
Open Block ↓
Once the map is visible, you can ask where it fails.
Before mapping, disagreement often sounds like:
But an argument can fail in more than one place.
Serious analysis identifies the location of the defect.
The information offered as evidence may be false, unreliable, incomplete, misreported, or unsupported.
The evidence may be entirely true, but the conclusion drawn from it may not follow.
The reasoning may depend upon a proposition that has not been established.
The evidence may support some conclusion, but not one as broad, certain, or demanding as the argument asserts.
That distinction is especially important.
Suppose a city reports that its cameras helped recover ten stolen vehicles.
That fact may be completely true.
If someone then concludes:
you do not refute the recovery evidence by showing that the conclusion does not follow.
The evidence may survive.
The inference is what failed.
Where did the argument fail?
For each case, identify the primary defect.
When the underlying records are checked, theft actually declined by 12 percent, and several reporting categories changed during the same period.
Assume that the recovery evidence is completely accurate.
The reasoning depends on the proposition that combining many public observations cannot create a privacy interest different from any single observation.
Assume the evidence does establish that the technology creates meaningful privacy risks.
This technology creates privacy risks.
Therefore every use of this technology must be prohibited.
That question is the heart of inferential distance.
An argument can contain accurate facts, legitimate evidence, and reasonable intermediate claims while still reaching a conclusion that exceeds what those things establish.
“Is there evidence?”
It asks:
“What does this evidence actually establish — and where does the argument begin asking for more?”
Lesson 3 · Block 6
Don’t Argue with the Top Box
Move down the map
Open Block ↓
Disagreement is not yet analysis.
Suppose the conclusion at the top of the map says:
A student responds:
That may be an important consideration.
But notice what has happened.
This pushes against the conclusion but does not identify a defective claim, inference, assumption, or evidentiary link.
This directs analysis downward into the structure that is supposed to support the conclusion.
Ask:
You only have to show that the argument as presented does not successfully establish its own conclusion.
Which response actually analyzes the argument?
Lesson 3 · Block 7
The Strongest Objection May Be Lower Down
“Not established” is a legitimate result
Open Block ↓
You do not have to destroy the whole argument.
Suppose the argument reaches this conclusion:
The map contains three necessary supporting claims.
What should the critical thinker conclude?
What is the strongest warranted conclusion from this map?
This category matters because reasoning is often forced into a false choice:
Argument mapping gives you another possibility:
That does not mean the conclusion is false.
It means the reasoning presented has not carried the burden required to justify it.
You also do not have to adopt the opposite conclusion.
Lesson 3 · Block 8
The Argument-Mapping Exercise
Build the full structure
Begin Exercise ↓
Build the argument before you judge it.
You now have a new argument.
Do not begin by deciding whether you support the policy.
Find the destination. Work backward. Expose the bridges. Dig beneath the reasoning. Then identify the frame.
Public schools should require students to keep personal cellphones stored and unavailable during ordinary instructional periods. The purpose of school is to create an environment in which students can concentrate, interact with teachers and classmates, and develop habits necessary for sustained learning. Personal smartphones make that task more difficult because they continuously provide access to messages, games, social media, videos, and other material designed to compete for attention.
Schools that have limited student phone access frequently report that teachers spend less class time asking students to put devices away and that students participate more consistently in classroom activities. Some schools also report fewer conflicts arising from social-media exchanges during the school day. Although these observations do not prove that every student is distracted by a phone, they provide reason to believe that unrestricted access creates a recurring obstacle to the learning environment.
Parents sometimes object that students need immediate access to their phones in case of an emergency. But schools already maintain office phones, emergency procedures, and systems for contacting families. A policy can also allow exceptions for documented medical needs or other unusual circumstances. The existence of legitimate exceptions does not require unrestricted access for every student throughout the day.
Schools routinely place reasonable limits on behavior when those limits are necessary to carry out the educational purpose for which the institution exists. If unrestricted phone use materially interferes with attention and classroom order, and if students can still communicate with parents when genuinely necessary, schools are justified in restricting access during instructional time. For those reasons, public schools should require students to store personal cellphones during ordinary classroom instruction while providing limited exceptions for genuine needs.
Start at the finish and work backward.
What major propositions must be established for the conclusion to follow?
Now expose what supports the claims.
Do not merely place evidence beneath a claim.
Explain how the evidence is supposed to establish it.
What has the argument asked you to accept without fully proving?
The question is simply whether the author has defined the problem in a way that makes some considerations more visible than others.
The argument is now on the table.
Review what you reconstructed before evaluating any part of it.
Your map may contain strong claims, weak claims, contested assumptions, reliable evidence, questionable inferences, or important unknowns.
But those are evaluation questions.
First, the argument had to be made visible.
Lesson 3 · Block 9
Mark the Map
Supported · Disputed · Unsupported · Unknown
Open Block ↓
Now test the map one component at a time.
In Block 8, your task was to reconstruct the argument faithfully.
Now the task changes.
Use four categories.
A proposition may be plausible but unsupported.
It may have evidence but remain reasonably disputed.
Or the available material may simply leave it unknown.
Practice on the cellphone argument.
Below is a reconstructed version of the argument from Block 8. Evaluate each component based only on the material actually provided in the passage.
The argument no longer has to receive one verdict.
That binary is often too crude for serious reasoning.
A map may look more like this:
That is much closer to how serious reasoning actually works.
Each label describes the present state of the reasoning.
Supported means adequate support is present.
Disputed means reasonable disagreement remains.
Unsupported means the argument needs the proposition but has not established it.
Unknown means the available information does not let you determine it yet.
If an argument makes a necessary claim but offers no adequate basis for it, that component may be unsupported.
If the information available to you is simply insufficient to know whether a proposition is true, the appropriate mark may be unknown.
That distinction prevents lack of information from being mistaken for evidence against a proposition.
Lesson 3 · Block 10
Exit Exercise — How Far Can You Go?
Measure the inferential distance
Begin Final Exercise ↓
What does the evidence actually permit you to conclude?
At the beginning of this lesson, you encountered a series of statements about automated license-plate cameras and the conclusion:
Now return to the evidence itself.
- Automated license-plate cameras record visible license-plate numbers, dates, times, and locations.
- Records may be retained for a period of time and searched by authorized law-enforcement personnel.
- Information gathered from multiple locations can potentially reveal patterns concerning a vehicle's movements.
- The technology has assisted investigators in locating vehicles connected with reported crimes.
- The system therefore presents both legitimate law-enforcement uses and legitimate questions concerning collection, retention, access, and privacy.
“Which policy do I prefer?”
Do not answer:
“Which side am I on?”
Answer only:
“What is the strongest conclusion the available evidence actually permits?”
Sometimes the strongest warranted conclusion is narrower.
The narrower conclusion may sound less dramatic.
But if it is better supported, it is the stronger intellectual result.
This also explains the discipline developed in the previous blocks:
The Argument-Mapping Method
You can now carry this procedure into any argument.
You do not have to accept the opposite conclusion.
You do not have to choose a side before the evidence warrants one.
Sometimes the most responsible answer is simply:
An argument is not a pile of statements. It is a structure.
Find the conclusion. Work backward through the claims. Locate the evidence. Expose the inferences. Identify the assumptions. Examine the frame. Test every connection.
Then stop where the evidence stops.
Before You Decide
This course was not designed to tell you what conclusions to reach. It was designed to make it harder for you — or anyone else — to reach those conclusions for you before the evidence and reasoning have been examined.
You will still have convictions.
You will still encounter arguments that persuade you, anger you, confirm what you already think, or challenge something you have long believed.
The goal was never to eliminate those reactions.
The goal was to prevent the reaction from becoming the end of the reasoning process.
Three lessons. One discipline.
You learned that what you search for determines what you are likely to notice.
Reconstruction must therefore come before interpretation.
You learned that headlines, questions, labels, quotations, statistics, images, and omissions can direct attention before independent examination begins.
You learned to expose the structure connecting evidence, inferences, assumptions, claims, and conclusions.
The five disciplines
When you encounter a claim worth taking seriously, work through these questions.
Critical thinking does not require permanent uncertainty.
It requires that confidence track the evidence rather than outrun it.
The discipline also runs in the other direction.
You are not only a reader of arguments.
You are also a writer, speaker, teacher, advocate, friend, parent, citizen, and participant in conversations.
Before you publish a headline, repeat a claim, share an image, quote someone, choose a statistic, or frame a question, ask:
What am I making easier for that person to notice?
What am I making easier to overlook?
Am I giving the reader enough information to reason — or merely enough information to react?
Use the discipline wherever claims compete for your attention.
Examine what is actually present. Recover what the argument says. Expose how the reasoning works. Test what the evidence establishes. Then decide how much confidence the conclusion deserves.
