Identify key steps in a process, determine domain vocabulary in context and describe how a history text presents information

Learning goal: Identify the key steps in a text's description of a process related to history/social studies, determine the meaning of words and phrases as they are used in the text, including vocabulary specific to domains related to history and social studies, and describe how a text presents information: sequentially, comparatively or causally.

Original explanatory text — How a Lift Lock Moves a Boat Uphill (written for this lesson).

A canal is a road made of water, and water will not run uphill. Where the land rises, canal builders cut the route into a series of flat sections called levels and joined them with locks. A lock is a stone or timber chamber, a little longer and wider than a boat, closed at each end by a pair of heavy wooden gates. In the lower half of each gate is a small door, called a wicket or paddle, that can be opened with a long iron bar to let water through while the gate itself stays shut. A lock tender, employed to operate the lock, lives beside it. The description below follows a boat traveling from a lower level to a higher one; suppose the difference between the two levels is nine feet.

First, the boat approaches from the lower level. The tender has already set the lock: the lower gates stand open and the upper gates are closed, so the chamber holds water at the lower level. The boy driving the mules slows them, and the boat glides into the chamber.

Second, once the boat is fully inside, the tender pushes the lower gates shut behind it and makes sure the wickets in those gates are shut, so that the chamber can hold water. The two leaves of each pair of gates meet at an angle pointing toward the higher water, so that the pressure of the water presses them together and seals them.

Third, the tender opens the wickets in the upper gates. Water from the upper level pours into the chamber. Nothing else has to be done to lift the boat; the water does the work.

Fourth, the chamber fills and the boat rises with the water. This takes a few minutes for a nine-foot lift. When the water inside the chamber is level with the upper level, the pressure on both sides of the upper gates is equal and they can be moved.

Fifth, the tender swings the upper gates open. The mules take up the tow line and pull the boat out onto the upper level.

Finally, the tender closes the upper gates and shuts their wickets, so that no more water enters from above. What happens next depends on the next boat. If it is also coming uphill, he opens the wickets in the lower gates to drain the chamber back down to the lower level, then opens the lower gates, and the lock stands as it did in the first step. If the next boat is coming downhill, he leaves the chamber full and reopens the upper gates for it. Whenever a lockage fills the chamber from above and the chamber is later drained, the water between the two levels in the chamber, called a lockful, passes from the upper level to the lower one. An uphill boat followed by a downhill boat shares one fill and one drain, so how much water each boat uses depends on the order of traffic; but a busy lock still sends lockful after lockful downhill, which is why a summit level needs a reservoir or feeder to keep it supplied.

A boat going downhill follows the same steps in reverse: it enters a full chamber through the open upper gates, the upper gates and their wickets are closed, the lower wickets are opened to drain the chamber, the boat sinks to the lower level, and the lower gates are opened to let it out.

Original informational text — Two Ways to Move Grain, and Why One Won (written for this lesson; the county and all figures are hypothetical).

Consider a farmer in an inland Ohio county in the 1850s with a wagonload of wheat to sell in Cleveland. Two carriers compete for the load. The canal boat and the railroad car both move far more than a wagon, but they differ in speed, season and reach.

The canal boat moves at a walking pace, since mules pull it. The railroad car moves at the speed of the locomotive, several times faster. The canal closes when it freezes and reopens when the ice goes out, so it carries nothing through the winter months. The railroad runs in January. The canal reaches only the towns built along the water; the railroad, once its line is laid, reaches the towns its company chooses, and a new line can be laid more quickly than a new canal can be dug. Against all this, the canal's advantage was price: for a long time, a ton of grain went farther for less by water.

That price advantage did not hold. Suppose that in this imagined county the canal charged two cents a ton-mile in 1848 and the railroad, when it arrived in 1852, charged three. As the railroad carried more freight, it could spread the cost of its track and engines across more loads and cut its rates. Shippers who valued speed switched first; those who valued price followed as the rates fell. Lower canal traffic meant lower toll income for the state, which meant less money to repair locks and dredge channels, which meant slower and less reliable service, which drove more shippers to the railroad. Each effect became the next cause. By the end of the decade, in this imagined county, the railroad carried the grain and the canal carried what was left.

Key steps in a description of a process. History and social studies texts often describe processes: how a lock moves a boat, how a bill becomes law, how a central bank raises or lowers interest rates, how a territory became a state. A process description contains three kinds of sentences, and identifying the key steps means telling them apart. A step is an action that changes the state of the thing being described: "the tender pushes the lower gates shut." A condition tells you what must be true before or after a step: "once the boat is fully inside." A detail explains or decorates but does not move the process: "the two leaves of each pair of gates meet at an angle." The test for a key step is removal. Take the step out and ask whether the process still works. Remove "the tender opens the wickets in the upper gates" and no water enters the chamber; nothing rises. That is a key step. Remove the sentence about the angle of the gates and the boat still goes up; that sentence explains why the second step works but is not itself a step. Sequence words mark steps, but do not rely on them alone; writers sometimes bury a key step in the middle of a sentence or fold two steps into one, as the fifth step folds opening the gates and towing the boat out.

Apply the same test to a civic process. In a legislature with two houses, such as Ohio's General Assembly, a text describing how a bill becomes law will mention introduction in one house, consideration by a committee, votes in each house, the requirement that both houses agree to the same wording, and the governor's decision to sign or veto, with a further vote in the legislature if a veto is to be overridden. Which of these are key steps? Remove "both houses agree to the same wording" and the bill never reaches the governor; it is a key step. A sentence about how many members sit on a committee is a detail. When you list the key steps of a process, list the actions in order, in your own words, and check that a reader who followed only your list would arrive at the end state. Consult the General Assembly's own current description before you rely on any particular version of the Ohio process, because details such as vote thresholds and deadlines are set by the Ohio Constitution and by law, not by a reading lesson.

Words and phrases as they are used in the text. Much of the vocabulary in a history text is specific to a domain, a field of work or study with its own terms. Some domain words are simply new (wicket, lockage, feeder, ton-mile). The harder ones look familiar but carry a different meaning in the domain. Lock in this text is not a device on a door; it is a chamber with gates. Level is not a tool or a description of flatness; it is a stretch of canal at one height. Gate is a wall of timber that holds back water, not a garden entrance. Toll is a charge for passage, not the sound of a bell. To determine the meaning of a word or phrase as it is used, do four things. Look for a definition the writer supplies ("a small door, called a wicket or paddle"). Look for a restatement or example nearby ("suppose the difference between the two levels is nine feet"). Look at what the word does in its sentence: a lock that "holds water at the lower level" is a container, not a fastening. Finally, check the meaning against a reference for the domain, because a writer can use a term loosely. A phrase can be domain-specific too: "the ice goes out" means the spring thaw that reopens the canal, not a delivery. Write the domain meaning in your own words in the margin the first time a term appears, and reuse that meaning when you summarize.

How a text presents information. Structure is the pattern by which a text arranges its information, and it is not the same as the topic. Three patterns are common in history and social studies. A sequential text presents events or steps in order; its signals include first, then, once, until, finally, and dates. The lock description is sequential. A comparative text presents two or more things side by side on the same features; its signals include both, differ, whereas, against this, and parallel sentences that treat each subject in turn. The first two paragraphs of the grain text are comparative: canal and railroad are compared on speed, season, reach and price. A causal text presents one thing as producing another; its signals include because, so, meant, led to, as a result, and chains in which each effect becomes the next cause. The last paragraph of the grain text is causal. Describing how a text presents information means naming the pattern, pointing to the signals and the arrangement that reveal it, and saying what the pattern lets the writer do. Here the comparison sets up a puzzle (the canal was cheaper, so why did it lose?) and the causal chain answers it.

A fully worked model. Question: what are the key steps in the lock description, and how is it structured? Steps, in order and in my own words: the boat enters the chamber, which is set at the lower level; the lower gates are closed and their wickets shut; the upper wickets are opened; the chamber fills and the boat rises; the upper gates are opened and the boat is towed out; the upper gates and their wickets are closed, and then either the chamber is drained and the lower gates opened or the chamber is left full, depending on which way the next boat is traveling. Six steps. Reasoning for excluding sentences: the angle of the gates explains step two; the note about the summit reservoir explains a consequence of step six; neither changes the state of the boat. The sixth step is a step with a condition attached: what the tender does depends on the next boat's direction, and a list that dropped the condition would reset the lock wrongly for a downhill boat. Structure: sequential, signaled by the words first through finally and by the fact that each paragraph depends on the state left by the previous one; the final paragraph, on going downhill, is a compressed sequence in reverse.

A misconception. Students often decide that a text about two things is comparative and a text about history is sequential. A text about canal and railroad could be sequential (the history of each, year by year) or causal (why one replaced the other). Look at how the sentences are arranged and which words join them, not at the subject.

Worked step extraction from a causal text: The final paragraph of the grain text describes a process too, but its steps are cause-and-effect links rather than actions in time. Listed in order: the railroad carries more freight; it spreads its fixed costs and cuts its rates; price-minded shippers switch; canal traffic and state toll income fall; repairs and dredging are cut; service gets slower; more shippers switch. Seven links. The removal test still works: take out the fourth link, "canal traffic and state toll income fall," and there is no reason for repairs to be cut, so the chain breaks. Note that the order is logical rather than strictly chronological, and that the figures (two cents, three cents, 1848, 1852) are the text's own hypothetical numbers, not measurements.

Worked vocabulary in context: Ton-mile. The text pairs it with a price, "two cents a ton-mile," and the previous paragraph restates the idea as "a ton of grain went farther for less." So a ton-mile is the unit a freight rate is charged on: one ton carried one mile. Feeder. The text says "a summit level needs a reservoir or feeder to keep it supplied," and the sentences before explain that filling and draining the chamber sends a lockful of water downhill. So a feeder is a channel that brings water into the canal to replace what the locks send down. Both meanings come from the sentences around the word; neither could be guessed from the everyday sense of ton, mile or feed.

Worked structure description: Take the second paragraph of the grain text. Pattern: comparative. Evidence: the sentences alternate, "The canal boat ... The railroad car ... The canal closes ... The railroad runs ... The canal reaches ... the railroad ... reaches," and each pair treats one feature (speed, season, reach). The final sentence, "Against all this," pivots to the one feature on which the canal wins, price. What the pattern does: it builds a puzzle for the causal paragraph to solve. A description that said only "the paragraph is about canals and railroads" would name the topic and miss the structure.

Process map (representation): Draw the six lock steps as boxes in order. In each box note the water level in the chamber (lower or upper) and the state of each pair of gates and of their wickets (open or closed) after the step. Beside each box copy the sentence from the text and mark it S (step), C (condition) or D (detail). Then redraw the map for a boat going downhill, using the reversed sequence in the last paragraph. Check with a partner that both maps end with the chamber ready for the next boat.

Independent performance: Choose three paragraphs, one sequential (from the lock text), one comparative and one causal (from the grain text). For each paragraph: name the pattern by which it presents information; quote two signal words or phrases; list the key steps, or the compared features, or the links in the causal chain, in your own words; and define two domain-specific words or phrases as they are used, citing the sentence that establishes each meaning. Success criteria: every listed step passes the removal test; every definition is drawn from the text first and a reference second; every structure label is justified by arrangement and signals, not by topic; no historical claim is added that the texts do not contain; and the hypothetical county and figures are labeled hypothetical.