Cause-and-effect passage structure

A passage may explain that a change in rainfall affected crop yields, or that a policy altered behavior through an incentive. Your task is to trace the stated relationship, not assume every event mentioned caused the next one.

Map the chain

1. Name the effect or outcome the passage explains.
2. Locate the stated cause or contributing condition.
3. Find the mechanism: how the cause is supposed to produce the effect.
4. Note intermediate steps, time delay and conditions that change the result.
5. Separate primary causes from background factors or consequences that feed back into the system.

Signal words are clues

“Because,” “therefore,” “as a result,” “led to” and “due to” may signal causation. But “after” often signals sequence, and “associated with” can indicate correlation without a causal claim. Read the logic around the connector and check whether the author provides a mechanism or evidence.

Watch for alternative explanations

Two events may move together because a third factor affects both. A later event may follow an earlier one by coincidence. A cause can be necessary without being sufficient, or one of several interacting causes. Preserve the author's qualifications and do not convert “may contribute” into “always causes.”

Question strategy

• For a main-idea question, summarize the whole causal explanation rather than one example.
• For an inference, choose only what follows from the described mechanism.
• For an author's purpose, explain why the passage traces the cause or consequence.
• For a critique, identify missing controls, alternative causes or evidence that would strengthen the causal claim.

Distinguish cause, mechanism, and consequence

A complete causal explanation usually contains more than two events placed next to each other. It identifies a proposed cause, describes a mechanism that connects it to the outcome, and names conditions that strengthen or weaken the connection. For example, a passage might explain that a longer dry period reduces soil moisture, which stresses young plants and lowers later crop yields. The dry period is the initial cause, low soil moisture is an intermediate step, and reduced yield is the effect. If a question asks for the mechanism, selecting only the first or final event is incomplete.

A cause can be one contributor among several. A necessary condition must be present for an outcome to occur in the described situation, while a sufficient condition would produce the outcome by itself. Many real explanations are neither simple nor deterministic: one factor raises the likelihood of an effect, but does not guarantee it. Preserve words such as “can,” “may,” “contributes,” and “under these conditions.” Replacing them with “always” or “must” makes a qualified claim stronger than the author made.

Separate causation from timing and association

If event B occurs after event A, the sequence is compatible with A causing B, but it does not prove the connection. If two measures rise together, they may be associated because one affects the other, because a third factor affects both, or by coincidence. A mechanism makes a causal explanation more plausible, but evidence is still needed to test it. Questions may ask what a passage states, what it implies, or what evidence would strengthen its argument; keep those tasks separate.

• Reverse causation: an outcome may influence the supposed cause. A school might add tutoring because scores declined, so later low scores do not show tutoring caused the decline.
• A confounding factor: a third condition affects both measures. Hot weather could raise ice-cream sales and swimming activity without either causing the other.
• Selection effects: the people or cases observed may differ from those not observed, creating a pattern that does not represent the whole population.
• Feedback: an effect can later become a cause in a continuing cycle, such as low confidence reducing practice, which then weakens performance further.

Trace a multi-step explanation

Represent each step in a short chain and label the evidence the passage provides for each arrow. In a policy passage, a fee reduction might lower the cost of participation, leading more people to enroll; the added enrollment could then raise total program spending. The first effect can be beneficial while the later consequence creates a tradeoff. Do not collapse the chain into “the fee reduction was good” or “the fee reduction was bad” unless the author evaluates those outcomes. A main-idea answer should capture the whole explanation and its purpose.

What evidence would support the link?

Look for comparison groups, measurements taken before and after a change, repeated observations, a plausible mechanism, and whether other explanations were considered. A passage may use an example to illustrate a mechanism without proving how often it occurs. It may cite a correlation while acknowledging that the cause remains uncertain. When asked to critique a causal argument, identify the missing link specifically: no comparison group, a different population, an unmeasured factor, or a time period too short to observe the effect.

Answer from the passage's level of evidence

For a main-idea question, describe the relationship the passage develops rather than one supporting detail. For an inference, choose a consequence that follows from the stated mechanism without adding an outside assumption. For an author's purpose question, explain why the author traces the chain—for instance, to show why a result occurred or why a proposed remedy might work. When the text gives only a sequence, use sequence language; reserve cause language for a relationship the author actually asserts.

Separate temporal order from causal evidence

A cause must precede its effect, but an event occurring first does not prove it caused the later event. If a school changes a schedule and scores later rise, the order is consistent with a causal explanation, yet other changes may account for the increase. Look for comparison groups, controls, or evidence that addresses alternative causes.

One effect can have several causes, and one cause can lead to multiple effects. A passage may describe immediate and long-term consequences or distinguish necessary from contributing factors. Map the chain with arrows and use the author’s level of certainty; do not collapse several links into one simple cause if the text presents a more complex pathway.

Exam takeaway

Track cause → mechanism → effect, including conditions and alternative explanations. Do not confuse chronology or correlation with proof of causation.