IELTS Reading · Ch 19

Inference vs. Explicit Information

Where "Not Given" hides

Topic & Why It Matters

IELTS Reading does not only test whether you can find words. It tests whether you can decide exactly what the passage proves, what it contradicts, and what it never tells you. This matters most in True / False / Not Given, Yes / No / Not Given, Multiple Choice, and any question that uses words like implies or suggests.

Many lost marks come from treating a possible conclusion as a proven one. The skill in this chapter is evidence control: answer only what the text licenses, and identify the precise extra claim that the passage does not support.

Knowledge Points

Explicit information is directly stated
A statement is explicit when the passage says the same idea clearly, even if the wording is paraphrased. You do not need to add extra assumptions; you only need to connect the question language to the passage language.
Inference must be necessary, not merely possible
An inference is valid only when the passage forces that conclusion. If the statement could be true but the passage does not make it necessary, the answer is usually Not Given.
Not Given often hides in missing comparison
IELTS distractors often mention a real topic from the passage but add a comparison that is absent: cheaper than, more effective than, the first, the only, the largest, or better than before. If the comparison is not supported, choose Not Given.
Opposite evidence creates False
False means the passage gives evidence against the statement. It is not enough that the statement feels unlikely; the text must contradict it through opposite wording, a different number, a different time, or a different cause.
Certainty words decide borderline answers
Words such as all, always, never, only, proved, likely, may, and some change the strength of a claim. A passage that says 'may reduce delays' does not prove a statement saying 'will remove delays'.
Inference questions still need a location
Even when a question asks what the writer implies, the answer must come from a precise passage window. If you cannot point to the sentence that licenses the inference, you are probably guessing.

Step-by-Step Strategy

1
Classify the statement type
Ask whether the statement is factual, comparative, causal, or evaluative. Comparative and causal statements need especially careful proof.
2
Underline the extra claim
Separate the topic from the added claim. In 'the trial was cheaper than the previous system', the topic is the trial; the extra claim is the cost comparison.
3
Find the answer window
Scan for stable anchors such as names, dates, places, or technical terms. Read at least one sentence before and after the anchor.
4
Test three outcomes
If the passage supports the statement, choose True. If it contradicts the statement, choose False. If it discusses the topic but does not prove or disprove the added claim, choose Not Given.
5
Check strength and scope
Compare certainty, quantity, time, and comparison words. Many Not Given answers are created by overstating a weak or limited passage claim.
6
Name the evidence
Before you move on, say the bridge: 'monitoring continued after launch' supports 'not abandoned after launch'. If you cannot name the bridge, re-check the window.

Common Pitfalls

MistakeCorrective Rule
Treating likely as provenIf the passage uses cautious language, do not upgrade it to a definite claim in your answer.
Choosing False for missing informationFalse needs contradiction. If the passage is silent about the added claim, the answer is Not Given.
Ignoring comparison wordsMore, less, first, only, best, and largest must be supported by an actual comparison in the passage.
Using outside knowledgeAnswer from the passage only. Real-world plausibility does not turn an unsupported statement into True.
Reading only the sentence with the keywordThe evidence may sit immediately before or after the keyword sentence, especially when pronouns or contrast markers are involved.

Vocabulary & Signpost Bank

SignalWhat It Means for Your Strategy
explicitly states / directly reportsThe passage gives the claim itself; paraphrase may still be required
suggests / implies / indicatesA conclusion is supported by the evidence, but may not be worded identically
may / might / could / is likely toWeak or cautious claim; do not convert it into certainty
proved / confirmed / demonstratedStrong claim; check whether the passage really reaches this level
more than / less than / compared withRequires a comparison in the passage, not just two related facts
only / always / never / allRestrictive language; one exception or a missing universal claim changes the answer
because / due to / resulted fromCause language; the reason must match the passage, not merely the outcome
not mentioned / no informationThe topic may appear, but the specific added claim is absent

Practice Passage & Questions

Read the passage, then decide whether each statement is TRUE, FALSE, or NOT GIVEN. Pay special attention to added comparisons, causes, and certainty words.

Smart Traffic Signals in Alderford~326 words
A

When the city of Alderford introduced smart traffic signals in 2021, officials described the programme as a limited experiment rather than a permanent redesign of the road network. The sensors counted vehicles, cyclists, and buses approaching each junction, then adjusted green-light timing every few minutes. The first phase covered twelve intersections near the central hospital, where ambulances had often been delayed by commuter traffic.

B

After six months, the transport department reported that average ambulance delay at those intersections had fallen by 18 percent during weekday mornings. Bus journey times also became slightly more predictable, although the average trip was not shorter across the whole route. Drivers on two side streets complained that they now waited longer at red lights, and the department acknowledged that the algorithm had favoured major routes more than planners had intended.

C

The city did not publish the system's full source code, citing a contract with the supplier, but it released monthly performance summaries and invited an independent university team to examine anonymised traffic data. The researchers found no evidence that the sensors collected personal information from phones or number plates. However, they warned that the data set was too short to judge whether the system would perform equally well during winter storms or large public events.

D

Public reaction was mixed. Hospital staff supported keeping the signals, while several neighbourhood groups asked for manual override controls at busy pedestrian crossings. In 2022, the council extended the trial to eight additional junctions but postponed a city-wide rollout until a longer evaluation could be completed. Council minutes show that cost was discussed, but they do not compare the smart signals with other traffic-management options.

Questions 1-8. Choose TRUE if the statement agrees with the passage, FALSE if it contradicts the passage, or NOT GIVEN if there is no information on this claim.

1.The smart-signal programme began as a limited trial rather than a permanent network redesign.
2.The first phase was introduced mainly to reduce delays for hospital staff travelling to work.
3.Average bus journeys became shorter across the entire route after six months.
4.The algorithm gave more priority to major roads than planners had expected.
5.The supplier refused to let the city release monthly performance summaries.
6.The university researchers concluded that the system would fail during winter storms.
7.Neighbourhood groups wanted pedestrians to have some human-controlled crossing support.
8.The smart signals were cheaper than other traffic-management options considered by the council.

Self-Check

Answer these from memory. If you cannot answer all three, re-read the relevant section.

  1. What is the difference between a valid inference and a possible but unsupported idea?
  2. Why does a missing comparison usually produce Not Given rather than False?
  3. Which four types of words should you check before deciding that a statement is True?
Answers:
  1. (1) A valid inference is forced by the passage evidence. A possible idea may sound reasonable, but the passage does not prove it.
  2. (2) False needs contradiction. If the passage mentions the topic but does not compare it with anything else, the added comparison is simply unsupported.
  3. (3) Check certainty words, quantity words, time words, and comparison words before accepting a statement as True.