Purpose and Proof

Overview

Students identify an author’s purpose—inform, persuade, or entertain—and explain how reasons and evidence reveal that purpose. They then use evidence from a short informational text to plan a clearly organized opinion paragraph, building on prior work with main ideas and text evidence.

Learning intentions

Students will be able to:

• Identify whether an author’s purpose is to inform, persuade, or entertain.
• Explain how an author’s reasons and evidence support a particular point.
• State an opinion about a school-related topic.
• Organize reasons and evidence to support that opinion.

Success criteria

• I can name the author’s purpose and explain my clues.
• I can match a reason or piece of evidence to the point it supports.
• I can state a clear opinion.
• I can group my reasons and evidence in a logical order.

Curriculum links

• Author’s purpose and use of reasons and evidence in informational text.
• Opinion writing: clear topic, stated opinion, and logical organization.
• Clear, coherent writing appropriate to task, purpose, and audience.
• Reading grade-level text with purpose and understanding.

Lesson structure (45 minutes)

1. 0–5 min · Hook and notice. Teacher displays three possible reasons for a school garden—“It gives students fresh vegetables,” “Everyone should support our garden,” and “The garden is a wonderful place for a surprise adventure”—using the opening purpose question. Students silently decide what each statement seems designed to do, then share one clue with a partner.

2. 5–12 min · Direct teach. Teacher introduces inform, persuade, and entertain with the Author Purpose Anchor Chart and the author purpose teaching slides. Explain that purpose is the author’s reason for writing, while point is a specific idea the author wants readers to understand; model clues such as facts, strong opinion words, reasons, examples, and imaginative details. Students record the three purposes and one clue for each on the author purpose and evidence worksheet.

3. 12–20 min · Guided reading and evidence match. Teacher reads aloud the following short text, projecting it with the guided reading text:

Our school should start a recycling program. Last year, our class filled four large bags with plastic bottles in one week. Recycling would keep useful materials out of the trash and teach students responsible habits. If every classroom used labeled recycling bins, our school could reduce waste without spending much money.

Ask: “What does the author want readers to believe or do?” and “Which evidence supports each point?” Students annotate or complete the matching section of the author purpose and evidence worksheet, identifying the purpose, the author’s main point, and at least two supporting details.

4. 20–29 min · Think-pair-share analysis. Teacher models one response: “The author’s purpose is to persuade because the author states an opinion and gives reasons and evidence.” Use the evidence discussion prompts to guide pairs through: “What is the opinion?” “Which sentence gives a fact?” and “How does that fact support the opinion?” Students compare answers, draw lines from evidence to the points it supports, and revise their explanations in complete sentences. Check several responses and address the difference between a reason (“recycling reduces waste”) and evidence (the class filled four bags).

5. 29–40 min · Independent opinion planning. Teacher presents the prompt on the writing task and planning steps: Should students have ten minutes of independent reading every school day? Model an opening that introduces the topic and states an opinion without writing the whole response. Students complete the planning section of the opinion paragraph planner by choosing a position, stating an opinion, and grouping two reasons with one relevant example or fact for each. They should order reasons logically—for example, strongest reason first—and draft a topic sentence and closing sentence. Circulate, asking, “How does this evidence support your reason?”

6. 40–45 min · Share and exit check. Teacher displays the reflection prompt on the closing review slide and invites two students to share a planned opinion and one supporting detail. Students complete the final box on the opinion paragraph planner: “The author of today’s recycling text mainly wanted to ___ because ___ and ___.” Collect worksheets as students leave.

Resources

• purpose, guided reading, and writing task slide deck
• author purpose and opinion writing worksheet
• the Author Purpose Anchor Chart
• Projector or interactive board
• Pencils and highlighters
• Document camera or classroom display

Assessment

• Listen during partner discussions for accurate identification of purpose and evidence-to-point connections.
• Review worksheet annotations and planning: students should identify persuasion, explain two supporting details, and organize two reasons for an opinion.
• Use the final response as an exit check; reteach students who name a purpose without citing a text clue.

Differentiation

• Provide sentence starters: “The author’s purpose is ___ because ___”; “This evidence supports the point that ___”; and “I believe ___ because ___.”
• Read the passage aloud twice, display key vocabulary, and allow students to discuss ideas before writing. Pair students strategically and provide enlarged text or speech-to-text support when needed.
• For students needing additional support, offer two possible purposes and a partially completed evidence match, then conference before independent planning.
• Challenge ready writers to include a counterargument or explain why one piece of evidence is stronger than another.