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Reading & WritingChapter 5: Text Structure and Purpose

Notes

Problem and Solution Notes

Track problems, attempted solutions, limitations, and revised responses precisely.

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Problem–solution passages often develop through more than two steps: challenge, attempted response, limitation, revised approach, and measured result.

What the SAT is testing

Every topic in this chapter maps to Craft and Structure → Text Structure and Purpose. The official task is rhetorical analysis of one short text: main purpose, a referenced portion's function, or overall structure.

Main idea vs main purpose

Keep these layers separate

Problem

Obstacle or limitation. Example: rigid grip drops uneven objects.

Response

Action taken. Example: flexible segments added.

Result

Measured outcome and tradeoff. Example: more shapes lifted, slower movement.

Content vs function

A sentence explaining why the first method failed may identify the limitation that motivates the alternative introduced next.

Part-to-whole function
The contribution a referenced phrase, clause, sentence, or detail makes to the passage's development as a whole.

Common rhetorical functions

Useful rhetorical verbs

  • introduces or contextualizes
  • illustrates or exemplifies
  • supports or substantiates
  • clarifies or elaborates
  • contrasts or compares
  • qualifies or limits
  • challenges or questions
  • explains
  • identifies a problem
  • presents a response
  • describes a result
  • establishes significance

Step-by-step strategy

Part-to-whole method

  1. Step 1

    Read the whole passage.

  2. Step 2

    State its overall point or purpose briefly.

  3. Step 3

    Read the exact referenced portion.

  4. Step 4

    Ask what new role it performs.

  5. Step 5

    Connect it to what comes before and after.

  6. Step 6

    Describe the role in your own words.

  7. Step 7

    Choose the option matching that primary role.

Worked examples

Worked example

Referenced-portion function

A rigid gripper lifted smooth blocks but dropped uneven objects. Referenced portion: Engineers replaced its flat pads with independently flexible segments. The new version handled more shapes but moved somewhat more slowly.

Question: Which choice best describes the function of the referenced portion in the text as a whole?

  1. The sentence presents the response designed to address the previously identified limitation.
  2. It merely repeats the target's content without advancing the text.
  3. It introduces an unrelated subject.
  4. It performs the role of the opening sentence.
  1. Whole

    State what the full passage develops.

  2. Target

    Engineers replaced its flat pads with independently flexible segments.

  3. Function

    The sentence presents the response designed to address the previously identified limitation.

The sentence presents the response designed to address the previously identified limitation.

Why each choice works or fails

  1. Correct: it states content plus relationship.
  2. Content paraphrase, not function.
  3. No topic shift occurs.
  4. Right kind of role, wrong target.
Worked example

Main purpose

A rigid gripper lifted smooth blocks but dropped uneven objects. Engineers replaced its flat pads with independently flexible segments. The new version handled more shapes but moved somewhat more slowly.

Question: Which choice best states the main purpose of the text?

  1. To explain how a specific detail develops and qualifies the passage's central account
  2. To list every fact related to the topic
  3. To persuade readers to adopt an unstated personal motive
  4. To define one isolated word
  1. Topic

    Name the subject without stopping there.

  2. Action

    The text explains and qualifies.

  3. Coverage

    The first choice covers the whole sequence.

To explain how a specific detail develops and qualifies the passage's central account

Why each choice works or fails

  1. Covers action, content, and qualification.
  2. Too broad and inaccurate.
  3. Unsupported purpose.
  4. Wrong task and too narrow.
Worked example

Overall structure

A rigid gripper lifted smooth blocks but dropped uneven objects. Engineers replaced its flat pads with independently flexible segments. The new version handled more shapes but moved somewhat more slowly.

Question: Which choice best describes the overall structure?

  1. It introduces a situation, presents a detail, and explains or qualifies that detail's significance.
  2. It states a conclusion before introducing an unrelated topic.
  3. It lists details without interpretation.
  4. It compares two separate authors.
  1. Move 1

    Introduce the situation.

  2. Move 2

    Present the focal detail.

  3. Move 3

    Interpret or qualify its significance.

It introduces a situation, presents a detail, and explains or qualifies that detail's significance.

Why each choice works or fails

  1. Correct moves and order.
  2. Reversed and unsupported.
  3. Omits interpretation.
  4. Wrong one-text structure.

Common traps and wrong-answer patterns

Difficulty progression
LevelTypical challengeBest response
FoundationDirect role and clear signalName content, then function
MediumPlausible nearby rolesUse before–target–after
ChallengingLayered structure and qualificationPrefer primary global contribution
Mini check

Mini check

Why might a passage explain the failure of an initial method?

  1. To establish the need for an alternative
  2. To prove no solution is possible
  3. To define an unrelated term
  4. To choose evidence not in the text
Show answer and explanation

Answer: To establish the need for an alternative

The limitation gives the next response its rhetorical motivation.

Key takeaways

Key takeaways

What to remember

  • Map every problem–response move.
  • Preserve certainty.
  • Connect limitations to revisions.
  • A proposed solution is not a guaranteed success.
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Put these notes into practice

Apply the ideas with SAT-style questions, then reinforce key details with flashcards.