Revising a Thesis for New Evidence: Study Guide (English Language 6.4)

A thesis is a working claim

Writers often begin with a first idea about what they will argue. That idea guides their search for evidence. But the purpose of gathering evidence is to find out whether the idea is right, and how far. The course framework states this plainly: consideration and use of new evidence may require revision of the thesis statement and/or changes to the line of reasoning.

Two things might change:

• The thesis itself. Its claim may need to be narrowed, qualified, broadened, given a condition or even reversed.
• The line of reasoning. The order and choice of body paragraphs may need to change so that they lead to the revised claim.

This is not a sign of weakness. It is the difference between an argument that was reasoned and one that was merely asserted.

Ways a thesis can change

Revision	What changes	Example (from “Schools should end homework.”)
Narrow	Limits the claim to a group, place or condition	“Schools should end homework for children under eleven.”
Qualify	Adds a hedge so that the claim fits the strength of the evidence	“Schools should probably limit homework, since the evidence on benefits is mixed.”
Add a condition	Says when the claim holds	“Schools should end homework unless it is short and regular practice.”
Broaden	Extends the claim because the evidence supports more	“Schools should reconsider all out-of-school work, not only homework.”
Reverse	Changes position because the evidence points the other way	“Schools should keep homework, but cap it.”
Refocus	Moves the argument’s centre to a more defensible point	“The question is not whether to set homework but how much.”

The revised thesis must still be defensible and specific, a claim that needs proof. “Homework is complicated” is not a revision; it is a retreat.

A method for revising

1. State the current thesis.
2. List the evidence and note what each piece supports, contradicts or complicates.
3. Test the thesis. Does it say more than the evidence shows? Does it ignore evidence that points elsewhere?
4. Choose the revision. Narrow, qualify, add a condition, broaden, reverse or refocus.
5. Write the new thesis. Check that it is a claim, that it is specific and that it fits the evidence.
6. Revise the line of reasoning. Rewrite topic sentences, reorder paragraphs, add or cut points.
7. Check commentary. Make sure each piece of evidence is explained in terms of the new thesis.

The key rule is that the evidence shapes the claim, not the reverse. Selecting only evidence that supports a first idea, and discarding the rest, is a way of fooling yourself, and a sceptical reader will see it.

Weak and strong responses to new evidence

Weak: The writer finds that a study shows homework helps in maths. The writer ignores it and keeps the thesis “Schools should end homework.”

Weak: The writer finds the same study and abandons the argument: “Homework is neither good nor bad.”

Strong: The writer finds the study, weighs it against the other evidence and revises: “Schools should end homework for young children and limit it for older students to short, regular practice in subjects like maths, where it appears to help.”

The strong version keeps a clear claim and uses the contrary evidence to make the claim more precise, and arguably more convincing.

Worked example 1: revising a thesis

Starting point. A student’s thesis: Schools should end homework.

Evidence gathered (invented for the exercise).

• E1. A teachers’ report finds that in mathematics, pupils who completed short, regular practice exercises improved more than those who did not.
• E2. A student survey finds that those who spend more than ninety minutes a night on homework report sleeping markedly less.
• E3. A school that ended homework for children under eleven reports no fall in test results.

Step 1: Test the thesis.

• E1 contradicts the claim for mathematics practice.
• E2 supports a claim about excessive homework, not homework as such.
• E3 supports ending homework for young children.

Step 2: Decide what the evidence supports. The evidence does not support “end homework” as a general claim. It supports (a) ending it for younger children, (b) limiting it for older students, and (c) keeping short, regular practice where it appears to help.

Step 3: Choose the revision. Narrow and add a condition.

Step 4: Draft the new thesis.

Schools should end homework for children under eleven and, for older students, limit it to short, regular practice, because the evidence suggests that long homework costs sleep while brief practice appears to help in subjects such as mathematics.

Step 5: Revise the line of reasoning. The original plan had three paragraphs: homework costs sleep; homework adds stress; homework does not raise results. The new plan:

1. Long homework costs sleep (E2).
2. Young children lose nothing when homework ends (E3).
3. Short, regular practice helps in mathematics, so it should be kept (E1).

Step 6: Check. The thesis is specific, defensible and consistent with all three pieces of evidence. The paragraphs lead to the claim in a logical order, and the evidence that first seemed to damage the argument now supports its limit.

Worked example 2: noticing a revision in a text

Read this passage (Marlbridge passage).

I used to think that a town should simply close its central car park. I had read the council’s survey, which showed that most residents wanted more green space, and I assumed the matter was settled. Then I read a planner’s account of a town that had done just that and found that the shops at the edge of the new square lost trade. I now think the car park should close, but only if the square is designed around the shops that depend on it.

Step 1: Identify the original thesis. The town should close its car park.

Step 2: Identify the new evidence. A planner’s account of shops losing trade.

Step 3: Identify the revised thesis. The car park should close, but only if the square is designed around the shops.

Step 4: Describe the type of revision. The writer added a condition (“but only if…”) while keeping the original direction.

Step 5: Describe the effect on the line of reasoning. The argument now has to show not only that residents want the square but also how it can be designed to protect the shops.

Step 6: Write the analysis sentence. The writer moves from an unqualified claim, based on residents’ preferences, to a conditional one, after meeting evidence that the change can harm shops, which makes the final position more credible because it responds to a counter-example.

Common misconceptions

• “My thesis should never change.” A thesis should change if the evidence shows that it is wrong or incomplete.
• “Revision means giving up.” A good revision keeps a clear, defensible claim.
• “I can keep my thesis and ignore the evidence that does not fit.” That weakens your credibility.
• “A qualified thesis is a weak thesis.” A qualified thesis that matches the evidence is stronger than an overstated one.
• “Only the thesis needs revising.” The line of reasoning, topic sentences and commentary often need to change too.
• “New evidence must overturn the thesis.” It may merely refine it or add a condition.

Self-assessment: rate your own revision

Criterion	Not yet	Getting there	Secure
Testing	The thesis is not tested against the evidence	Some evidence is considered	Every piece of evidence is weighed against the thesis
Revision	The thesis stays the same, or is dropped	The thesis is adjusted but still general	The thesis is narrowed, qualified, conditioned or reversed with a reason
Specificity	The new thesis is vague	Mostly specific	Specific, defensible and in line with the evidence
Line of reasoning	The body is unchanged	Some topic sentences changed	The topic sentences and their order lead to the revised thesis

Try it yourself

First thesis: “Schools should move to a four-day week.” Evidence (invented): (1) a trial school saved money on transport and heating; (2) parents of young children reported difficulty arranging care on the fifth day; (3) test results at the trial school were unchanged. Write a revised thesis and say what kind of revision it is.

Suggested answer

Schools should consider a four-day week where transport and heating costs are high and where care can be arranged for young children, because a trial showed savings without a fall in results.

This adds conditions (where costs are high; where care is available) and keeps the supported core of the claim (savings with no fall in results). The evidence on care for young children changes the claim from “should move” to “should consider where”. The body would need a paragraph on the care problem and how it could be met.

Where this leads

Next, the unit turns to tone. Topic 6.5 looks at how word choice and connotation create tone. To review how bias and limitations affect the weight of evidence, see Topic 6.3. Check your learning with the practice questions, the revision notes and the checklist.