03 Reading Analysis and Information Literacy

Find the main idea and structure

Informational reading involves identifying what a text, table, or chart says, understanding how its ideas fit together, and deciding whether the evidence justifies its conclusions. Strong readers distinguish explicit information from an inference and support their answers with relevant details. These skills apply in science, health, and other academic subjects, where written explanations may appear alongside numerical data.

Start by identifying the topic—what the text is about—and its central idea, the main point the author makes about that topic. Then consider how the text develops that idea.

Understand relationships and make inferences

A text may use one or more common structures:

• Description: gives characteristics or details.

• Sequence: presents steps or events in order.

• Cause and effect: explains why something happened and what followed.

• Compare and contrast: explains similarities and differences.

• Problem and solution: presents an issue and a response.

Signal words such as because, as a result, in contrast, first, and to solve this problem can help reveal a structure. However, the relationships between ideas matter more than any single signal word.

Explicit information is stated directly. An inference combines textual clues with reasonable background knowledge, but it should not go beyond what those clues support. For example, if a passage says a clinic extended its evening hours and evening visits rose, it is reasonable to infer that more people used the clinic at night. It would not be justified to conclude that the extended hours improved patients’ health unless the text also provides evidence about health outcomes.

Interpret charts and tables

Before interpreting data, check the title, labels, units, legend, time period, and source. Determine what each row, column, axis, or symbol represents. Pay attention to scale: an axis that starts above zero or uses uneven intervals can make a change appear larger or smaller than it is. In a table, identify the relevant row and column before comparing values.

For example, a table of evening clinic visits lists April at 40, May at 52, and June at 60. The visits increased by 20 from April to June. The table alone does not explain why they increased or establish whether the same patients returned; those conclusions require additional evidence.

When text and data appear together, check whether the numbers support the author’s description. Also check whether they cover the same scope: a chart may show only one location while the text discusses a whole region.

Evaluate arguments and sources

An argument usually includes a claim, supporting reasons, and evidence. Evidence may consist of measured results, examples, expert statements, or firsthand observations. Reasoning explains why that evidence supports the claim.

Evaluate an argument by asking:

1. What exactly is claimed? Separate the main claim from background information and examples.

2. Is the evidence relevant and sufficient? Relevant evidence bears on the claim; sufficient evidence is enough to justify the claim’s scope. One person’s experience may illustrate a problem but rarely establishes how common it is.

3. Is the reasoning valid? Check whether the conclusion follows from the evidence. A rise in visits after a new service begins does not prove that the service caused the increase; other factors may have changed.

4. Are limitations or alternatives considered? Look for missing comparison groups, small or unrepresentative samples, conflicting results, and acknowledged uncertainty.

5. Does the conclusion overreach? A conclusion should not be broader or more certain than its evidence allows.

When assessing a source, consider the author’s expertise, purpose, publication, supporting references, and timeliness, especially for changing topics. Check whether other credible sources corroborate important claims. Notice emotionally charged language, sweeping generalizations, and one-sided treatment of an issue. A viewpoint does not automatically make a source unreliable, but its evidence and reasoning still require scrutiny.

Apply a practical reading routine

Use this sequence when reading a passage, chart, or argument:

1. Preview the title, headings, labels, and source.

2. Read to identify the central idea and the author’s purpose.

3. Mark key claims and the details or data offered as evidence.

4. Check relationships, comparisons, units, and limits.

5. Decide what the evidence supports and what remains uncertain.

6. Answer with the most relevant textual or numerical evidence, avoiding added assumptions.

Effective information literacy combines understanding a text’s central idea and structure, reading its charts and tables accurately, and testing arguments against their evidence. Keep conclusions within the limits of the available information.