7.2 Supporting Arguments & Explanations

7.2 Supporting Arguments & Explanations

Quick Answer: After you lock a thesis, every supporting sentence must prove or illustrate that claim. Strong support uses relevant reasons, concrete examples, and specific details. On the PERT, expect items that ask which sentence best supports a claim, which detail is weakest, or which explanation most clearly develops the point. Match support to the claim’s key words—not to the general subject area.

PERT Writing competencies include supporting and illustrating arguments and explanations and, in related skills, establishing a claim and dealing with competing arguments. You will not write a research paper under timed adaptive conditions, but you will choose sentences that make a claim credible. The skill is selection and evaluation as much as invention: given a claim and a set of sentences, which ones actually do the work of proof?

Claim First, Then Proof

Support only makes sense relative to a claim. Before you rank options, restate the claim in a short clause and underline its load-bearing terms.

Claim: “The campus should add late-night bus runs on weekdays.”
Load-bearing terms: campus, late-night, bus runs, weekdays (not weekends), should add (policy change).

Support that helps:

• Many evening lab sections end after the last current bus.
• Students who work afternoon shifts miss earlier routes.
• A pilot survey found weekday night demand higher than weekend demand.

Support that only sounds related:

• Parking permits increased in price last year (cost issue, not night transit).
• The football stadium is hard to reach on Saturdays (weekend, different venue).
• Buses are an environmentally friendly idea in general (true-ish, not proof of this schedule change).

Types of Useful Support

Placement passages lean on a few reliable support types. You do not need citations from journals; you need logical relevance and specificity.

Circular support (weak): “Late buses are needed because students need late buses.”
Real reason (stronger): “Late buses are needed because STEM labs and library peak use continue after 10 p.m., when current routes stop.”

Building an Explanation: A Simple Pattern

When a stem asks which sentence best develops or best explains a point, look for a mini-chain:

1. Claim (what you want readers to accept)
2. Because / for example (reason or illustration)
3. So what (links the support back to the claim’s consequence)

Example chain:
Peer writing tutors should complete a short training in grammar terminology. Without shared terms, tutors give vague advice like “make it flow,” which leaves students unsure what to revise. Training lets tutors name issues such as subject–verb agreement so students can apply the feedback independently.

Each sentence either states the claim, supplies a reason, or shows the payoff. On multiple choice, the best “development” option is usually the middle or final link that adds new proving content, not a stylish restatement of the first sentence.

Weakest Support: How PERT Distractors Work

“Which sentence provides the weakest support?” is a high-yield stem. Rank every option by how directly it proves the claim.

If two options both support, the weaker one is usually vaguer, less specific, or only loosely related. The stronger one shares more key terms with the claim and supplies a clear logical bridge.

Relevant Examples vs. Decorative Detail

Examples earn their place only when a reader can see the mapping:

Claim → Example → Mapping sentence (explicit or obvious).

• Claim: Online appointment systems reduce no-shows at tutoring centers.
• Example: After one college required text reminders twenty-four hours before sessions, missed appointments dropped.
• Mapping: The reminder feature is part of the online system that keeps the appointment visible to students.

Decorative detail piles on color without mapping: listing the tutoring center’s paint color, sofa brand, or coffee selection may humanize a story in creative writing, but on PERT Writing it fails as support unless the claim is about atmosphere.

Establishing a Claim and Acknowledging Competing Points

Some items reward balanced but controlled argument. A competing point is useful when:

• It is a real objection a skeptical reader would raise, and
• You answer it without abandoning the original claim.

Effective concession pattern:
Critics argue that later school start times disrupt parents’ work commutes. Districts that staggered elementary and secondary bells, however, preserved adult schedules while still giving adolescents more morning sleep.

What goes wrong:

On selection items, the best sentence that “acknowledges another view” will name the view briefly and pivot back with a reason that still serves the original thesis.

Illustrating Explanations (Not Only Arguments)

Not every PERT passage is persuasive. Some explain a process, concept, or cause. Support then means clarity: definitions, steps in order, cause–effect links, and distinguishing examples.

Explanatory claim: “Composting reduces landfill waste by turning food scraps into soil amendment.”
Helpful illustration: “Fruit peels and coffee grounds break down in a bin and later enrich garden soil instead of occupying trash bags.”
Unhelpful flourish: “Landfills are sad places that nobody wants to visit.” (Tone without mechanism.)

When the purpose is explain, pick options that make the mechanism clearer. When the purpose is argue, pick options that make the position more believable. Misreading purpose is a common way to choose vivid but irrelevant support.

Practical Ranking Drill

For any support stem:

1. Restate the claim in your own words.
2. Cross out options that change the subject or population.
3. Cross out pure restatement and empty praise.
4. Among remaining options, choose the most specific and direct proof (or, for weakest-support stems, the opposite).
5. If a concession appears, keep it only if it is brief and answered.

Strong support is not the sentence that sounds smartest in isolation. It is the sentence that would convince a skeptical reader of this claim and only this claim. That discipline leads directly into paragraph unity and transitions: once support is relevant, it still must be ordered and connected so the reader never loses the line of thought.