Write a discipline-specific argument with a thorough thesis, precise claims, fairly developed counterclaims, cohesive links, formal style and a conclusion that follows

Learning goal: Write arguments focused on discipline-specific content: establish a clear and thorough thesis; introduce precise claims, distinguish them from alternate or opposing claims, and create an organization that establishes clear relationships among claims, counterclaims, reasons and evidence; develop claims and counterclaims fairly, supplying data and evidence for each while pointing out the strengths and limitations of both in a discipline-appropriate form that anticipates the audience's knowledge level and concerns; use words, phrases and clauses to link major sections, create cohesion and clarify relationships; establish and maintain a formal style and objective tone that follows the norms and conventions of the discipline; and provide a concluding statement or section that follows from and supports the argument.

What makes an argument discipline-specific. In a history class an argument answers a question about the past from sources; in a science or technical class it answers a question about the world from data and models. The norms differ. Historians cite sources by author, date and kind, weigh each source's origin, and use cautious verbs where the evidence is indirect ("suggests," "is consistent with"). Scientists report measurements with units and uncertainty, state the conditions under which a relationship holds, and separate data from interpretation. Both disciplines expect a formal style and an objective tone: precise nouns, no insults, no feeling offered in place of evidence, and opposing views described as their holders would describe them.

A clear and thorough thesis. A thesis states the position the whole argument will defend. Clear means a reader can say in one sentence what you believe. Thorough means it names the scope and the main qualification, so that the essay does not later contradict it. "The railroad was bad" is neither. "The railroad caused the flood" is clear but not thorough, and the sources do not support it as stated: they describe days of rain and a rising river as well as the fill. A thesis for the Harmon Falls question below: "The surviving sources support holding the railroad's 1909 fill responsible for turning the rising Tamber into a sudden surge into the Lower Ward in March 1913, and they suggest it added to residents' property losses by taking away the time to save belongings; they do not make the fill a cause of the rain or the river's rise, and they cannot show how deep the flooding would have been without it." It takes a position, sets a boundary, states what the evidence cannot show and previews two claims.

Precise claims distinguished from alternate and opposing claims. A claim is a statement the argument supports with reasons and evidence. Precise claims say exactly what is being asserted: not "the fill mattered" but "the fill turned a rising river into a sudden surge." A strong introduction names the alternatives and shows how yours differs. For Harmon Falls there are two opposing claims, one on each side: that the railroad caused the whole flood (the town's later belief, which Walter Pruitt reports) and that the railroad bears no responsibility because the rain would have flooded the Lower Ward anyway. The thesis above sits between them, and saying so in the introduction tells the reader what the argument will and will not prove.

An organization that shows relationships. Plan the argument as a structure, not a list: thesis; claim one with its reasons and evidence; claim two with its reasons and evidence; the counterclaim developed fairly with its own evidence; the response, showing what the counterclaim gets right and where it fails; conclusion. The relationships among claims, counterclaims, reasons and evidence should be visible in the paragraph order and in the topic sentences, so that a reader who reads only the first sentence of each paragraph can reconstruct the argument.

Developing claims and counterclaims fairly. Fair development supplies data and evidence for both sides, and points out the strengths and limitations of each. The claim's strength here is that two witnesses, one writing on the day and one recalling fifty years later, describe the same mechanism; its limitations are that no source measured how high the water would have risen without the fill, and that Walter's explanation may reflect decades of town talk. The counterclaim has two parts, and a fair response keeps them apart. Its first part, that the ward might have flooded anyway, has a real strength: the Lower Ward is bottom land beside a river that, as Walter grants, was rising anyway, and no source measures how far that flooding would have gone, so this part stays open. Its second part, that the fill therefore made no difference, is where its limitation lies: it cannot account for the single sudden release that witnesses describe. An argument that reports only its own strengths and the other side's weaknesses is advocacy, not analysis, and a knowledgeable reader will stop trusting it.

Anticipating the audience. Decide who will read the argument and what they already know and fear. Readers of a county historical journal know the town legend that the railroad "caused the whole flood," may have family who lived in the Lower Ward, and will be suspicious of an argument that either blames or excuses the company. They need the sources identified, not explained from scratch, and they need the concern "are you excusing the railroad?" answered directly.

Cohesion: words, phrases and clauses that link. Cohesion is the connection between parts. Use linking language that names the relationship: between claim and reason ("because," "since"); between reason and evidence ("as Clara's entry for 26 March shows," "according to the register"); between claim and counterclaim ("admittedly," "it is true that," "nevertheless," "even so"); between major sections (a transition sentence that closes one claim and opens the next: "If the fill explains the speed of the flooding, it also helps explain what was lost"). Clauses do more than single words: "Although the river would have risen without the fill" subordinates the counterclaim to the claim in one sentence.

Formal style and objective tone within the discipline. In school history writing, the usual conventions are to write in the third person (historians sometimes use the first person to explain their own method), use the past tense for past events, name sources precisely, and avoid judging people by today's standards unless that judgment is the point. In science, report quantities with units, use the passive or first-person plural as your teacher's conventions allow, and keep interpretation separate from results.

A concluding section that follows from the argument. The conclusion restates the thesis in light of what was shown, states the most important limitation, and says why the conclusion matters to the audience. It adds no new evidence and does not claim more than the body proved.

Original model argument — The Railroad Fill and the Lower Ward (from the fictional Harmon Falls sources).

In the years after March 1913, residents of Harmon Falls came to say that the railroad "had caused the whole flood." Others have answered that three days of rain would have drowned the Lower Ward in any case, so that the railroad bears no blame. Neither view fits the surviving sources. They support holding the railroad's 1909 fill responsible for the sudden surge into the Lower Ward, and they suggest that it added to residents' losses, but they do not make it a cause of the rain or the river's rise, and they cannot say how deep the water would have been without it.

The fill turned a rising river into a surge. Clara Whitlock, writing on 25 March, recorded men saying that water was "piling up against the embankment" because its single culvert was "choked with drift"; the next day she described a roar at about two in the morning, after which "the water that had been held behind it came through all at once." R. M. Ashby's 1988 essay adds an earlier warning: residents complained in 1910 that the fill "dammed the bottom." Because a diarist wrote on the day itself and a historian reports that the danger had been raised with the council three years earlier, the claim does not rest on memory alone.

That suddenness, in turn, probably added to the loss. Walter Pruitt, who was lifted from an upstairs window into a boat, recalled in 1963 that without the fill "we'd have had time to get the furniture upstairs." The register compiled in April 1913 shows 160 of the Lower Ward's 240 dwellings flooded, 66.7 percent, against 30.6 percent in the Mill Ward. Admittedly, Walter spoke fifty years later, and the register counts flooded houses rather than lost property, so neither measures the difference the fill made.

The strongest opposing view deserves its due. Walter himself insisted that "the river would have come up anyhow," and the Lower Ward lay on the bottom land. It is true that the river was rising on its own, and no source measures how high the water would have risen in the Lower Ward without the fill; the ward may have flooded in any case. Nevertheless, that possibility does not show that the fill made no difference: the opposing view cannot account for the single sudden release, rather than a slow rise, that witnesses on the hill and on Front Street both describe.

The sources therefore justify a limited but real finding: the railroad did not cause the rain or the river's rise, but its fill shaped how the water arrived in the Lower Ward, all at once rather than gradually, and the sources suggest, without being able to measure it, that the ward's residents paid for that difference.

Worked thesis revision: Draft: "In this essay I will discuss whether the railroad caused the flood." This announces a topic and takes no position. Second draft: "The railroad caused the Harmon Falls flood." Clear, but not thorough, and not supported as stated, since Walter grants that "the river would have come up anyhow." Final: "The surviving sources support holding the railroad's 1909 fill responsible for turning the rising Tamber into a sudden surge into the Lower Ward in March 1913, and they suggest it added to residents' property losses by taking away the time to save belongings; they do not make the fill a cause of the rain or the river's rise, and they cannot show how deep the flooding would have been without it." It is clear (one position), thorough (scope, qualification and the limit of the evidence) and arguable (both the legend and the opposite view disagree with it).

Worked fair counterclaim with strengths and limitations: A draft says, "Some people say the rain did it, but they are wrong." Revised: "The strongest opposing view holds that the rain alone would have flooded the Lower Ward, so the fill made no difference. Its strength is real: the ward lay on bottom land, and Walter Pruitt, who lived on Front Street, grants that 'the river would have come up anyhow'; no source measures how deep the ward would have flooded without the fill, so that question stays open. Its limitation is that it does not account for the single sudden release described by both Clara Whitlock and Walter Pruitt, which is evidence that the fill changed how the water arrived." The revision supplies evidence for the counterclaim, names its strength, names its limitation, separates the part of the counterclaim the sources cannot settle (whether the ward would have flooded anyway) from the part they answer (whether the fill made a difference), and answers the audience's likely concern ("are you excusing the railroad?") without exaggerating the answer.

Worked science version with discipline norms: Question: should the robotics team add weight to stop slipping on the 20° ramp? Thesis: "Adding weight will not stop the robot slipping on the 20° ramp; in the simple model the slipping stops only if tire friction is raised so that μ_s exceeds about 0.364, or if the ramp is lowered below about 16.7°, which the team could do only if it controlled the ramp." Evidence and data: the team's tilt test gives μ_s ≈ 0.30; tan 20° ≈ 0.364. Reasoning in the discipline's form: in the model, the robot slips when tan θ > μ_s, and mass cancels. Counterclaim with its strength: "heavier robots grip better," which is true for pushing a box because the box's resistance does not rise with robot mass. Limitation of the claim: rubber tires depart from the simple model, and enough grip removes the traction limit without guaranteeing a climb, which also needs enough motor torque, so the conclusion should be tested by a powered climb on the real ramp. Formal style: quantities with units, conditions stated, no "obviously."

Argument map (representation): Before drafting, draw a map with your thesis at the top, two claims beneath it, a reason and at least one piece of evidence under each, and the counterclaim on the side with its own evidence. Label each connecting line with the linking word or clause you will use in the essay ("because," "as the register shows," "admittedly," "nevertheless"). Beside the counterclaim and each claim, write one strength and one limitation.

Independent performance: Write a 450- to 600-word argument on a question from your current history or science unit, or on the robotics ramp, using at least three sources or one data set and two sources. Success criteria: (1) a clear and thorough thesis naming scope and qualification; (2) an introduction that names at least one alternate or opposing claim and distinguishes yours; (3) paragraphs whose topic sentences show the relationships among claims, counterclaims, reasons and evidence; (4) a counterclaim developed fairly with its own data and evidence, and the strengths and limitations of both claim and counterclaim stated; (5) at least one sentence that addresses the audience's likely concern; (6) linking words and at least two linking clauses that clarify relationships; (7) formal style, objective tone and the discipline's conventions (sources with dates in history; units and conditions in science); (8) a conclusion that follows from the argument and adds no new evidence.