Week 3 — Lecture Outline · Selecting a Topic, Purpose & Thesis

Course: Public Speaking — Fundamentals of Oral Communication (COMM 1) · Silver Oak University (fictional sample) · Prof. Marchetti
Objective covered: Objective 2 — Analyze audiences and adapt content, purpose, and language to meet audience needs; select and narrow a topic, write a general purpose, a specific purpose, and a thesis (central idea).
SLOs touched: A (compose & deliver — writing the purpose-thesis planning documents for a speech) · B (critical listening & analysis — evaluating whether a specific purpose is well-formed)
Meeting pattern: 2 sessions × 75 min = 150 min. Segment minutes below total ~150; scale to your own pattern.

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Week at a Glance

The week's big question	"How do I turn a broad topic into a focused, speakable message — and what is the difference between a specific purpose (my goal) and a thesis (my message)?"
By the end of the week, students can…	(1) name the three general purposes (to inform / to persuade / to entertain/mark an occasion) and choose the right one for a situation; (2) write a well-formed specific purpose — a single infinitive phrase that is audience-centered, covers one idea, and is achievable in the time limit; (3) write a thesis (central idea) — a full declarative sentence stating the speech's main message; (4) explain the key difference between a specific purpose and a thesis.
Key vocabulary	general purpose (to inform / to persuade / to entertain or mark an occasion); specific purpose statement (a single infinitive phrase — audience-centered, one idea, achievable); thesis / central idea (a full declarative sentence stating the main message); brainstorming, self-inventory; narrowing (purpose / audience / context / time filters); topic vs. thesis; well-formed vs. flawed specific purpose
Materials	slides (Deck 3), the week's readings + video links, one approved chatbot (Gemini / Claude / ChatGPT) for the AI-critique moment and the tutorial
Timing note	8 segments, ~150 min total. Session 1 = Segments 1–4 (~75). Session 2 = Segments 5–8 (~75).

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Segment 1 — Hook & the Problem of "Too Much" (8 min) · Session 1 opens

Hook. Start with a challenge: "I want you each to think of the most interesting topic you know something about — any subject at all. Now imagine someone handed you a microphone and said, 'You have five minutes. Go.' What goes wrong?" Take a few responses aloud.

The typical answer: everything. Too much to say, no idea where to start, rambling, going over time. "The problem is almost never that you have nothing to say. The problem is that you have too much — and no plan for cutting it down to size."

The promise: "This week you get a three-part planning tool — general purpose, specific purpose, and thesis — that solves that problem for any topic, in about ten minutes, before you spend a single hour researching."

Why it matters line (memory hook): "A focused speech isn't the result of having less to say. It's the result of making a plan."

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Segment 2 — The Three General Purposes (15 min)

Plain language first. Every speech has a general purpose — the broadest label for what it is trying to do. Three options:

• To inform: the speaker's goal is to build the audience's knowledge or understanding — to teach, explain, or demonstrate something. No advocacy; the speaker takes no side. (Full treatment in Week 11.)
• To persuade: the goal is to influence the audience's beliefs, attitudes, values, or actions — to move them toward a position or a behavior. (Full treatment in Weeks 12–13.)
• To entertain or mark an occasion: the goal is to fit a special occasion — celebrate, commemorate, roast, or entertain — while still making a meaningful point. (Full treatment in Week 14.)

Why identifying the general purpose first matters:
- It shapes which specific purpose forms are available.
- It shapes the kind of evidence that counts as "good."
- It shapes how you judge whether the speech succeeded.

Classic distinction to nail early:
- ❌ "I am going to tell my audience about climate change." (Could be informing or persuading — which is it?)
✅ Cure: decide the purpose first: to inform = "I will teach my audience the scientific consensus on how greenhouse gases work — no advocacy." To persuade = "I will argue that this campus should switch to renewable energy." Same subject; completely different speeches.

Quick interaction (2 min): call out four speech scenarios; class identifies the general purpose (inform / persuade / mark an occasion). Keep it fast; this is recognition practice, not analysis.

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Segment 3 — The Specific Purpose (22 min)

The core tool. The specific purpose is a single infinitive phrase that states exactly what the speaker wants the audience to learn, believe, or do, framed around the audience. Form: "To [inform/persuade] my audience [about/to] ___."

Four tests for a well-formed specific purpose:

Test	What to check
One idea	Does it cover exactly one focused idea, not two or three crammed together?
Infinitive phrase	Does it start with "To inform…" or "To persuade…" — not a question, not a declarative sentence?
Audience-centered	Does it state what the audience will gain, not just what the speaker wants to do?
Achievable in the time limit	Can this really be covered well in the allotted time?

Walk through each test with examples, then flip to flawed cases:

• ❌ "To inform my audience about nutrition and exercise and sleep habits and stress management." → Two (actually four) ideas. Fix: pick one.
• ❌ "What are the benefits of meal prep?" → A question, not an infinitive phrase. Fix: "To inform my audience about three benefits of meal prep for college students."
• ❌ "I want to talk about meal prep." → Not audience-centered; speaker-focused. Fix: "To inform my audience about three strategies for affordable weekly meal prep."
• ❌ "To inform my audience about the complete history of the American healthcare system." → Not achievable in five minutes. Fix: narrow to one aspect.

Important: the specific purpose is a planning tool. It does NOT appear verbatim in the speech. It guides research, outlining, and delivery — then yields the stage to the thesis.

Quick interaction (4 min): project three purpose statements; class votes well-formed or flawed and states which test it fails. Accept brief written answers on scrap paper, then debrief.

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Segment 4 — The Thesis (Central Idea) + Interaction (20 min) · Session 1 closes (~75)

Plain language first. The thesis (also called the central idea) is the speech's main message in one complete declarative sentence. Unlike the specific purpose, the thesis IS spoken aloud — typically near the end of the introduction, after the speaker has gotten the audience's attention and revealed the topic.

Three features of a well-formed thesis:

1. Full declarative sentence — a subject + predicate that asserts something. Not a fragment, not a question, not a purpose phrase.
2. States the main message — what the speech actually says; what the audience will remember.
3. Plain language — the audience should be able to follow it without background knowledge.

The critical distinction — specific purpose vs. thesis (write it on the board):

	Specific purpose	Thesis
Form	Infinitive phrase	Declarative sentence
Speaker's role	Planning tool	Spoken aloud in the speech
Answers	What do I want the audience to gain?	What does the speech say?
Example	"To inform my audience about three strategies for affordable weekly meal prep."	"Affordable meal prep comes down to planning around sales, batch cooking, and smart storage."

Land the distinction: "The specific purpose is your goal; the thesis is your message. You need both, and they are not the same thing. If I handed you a topic and said 'Write the specific purpose and the thesis,' you would write two different sentences."

Interaction — Think-Pair-Share (6 min): project two topics (e.g., campus bike parking, sleep and academic performance). Students: (a) choose a general purpose, (b) draft a specific purpose, (c) draft a thesis. Pair and compare. Debrief: what problems came up? (Common: thesis that is not a full sentence; specific purpose that is not an infinitive; two ideas in one specific purpose.)

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Segment 5 — Brainstorming & Narrowing (18 min) · Session 2 opens

Set it up: "Where does a speech topic come from? And once you have a subject, how do you cut it down to something manageable? This is the most underrated step in speech prep — most bad speeches start with a topic that was never properly narrowed."

Three sources for topics:

1. Self-inventory: What do you already know, care about, or have direct experience with? Your own expertise and curiosity is the most efficient starting point for a short speech. A self-inventory exercise: list ten things you know well enough to explain to someone in five minutes.
2. Audience interest: What does this audience need or want to know? Audience-centeredness starts at topic selection. A topic you find fascinating but your audience already knows inside-out — or cannot relate to at all — is a poor choice.
3. The occasion: What does the context permit or require? A classroom informative speech has different constraints (and opportunities) than a community panel, a workplace presentation, or a wedding toast.

The narrowing funnel — four filters (teach these explicitly):

Filter	Question to ask
Purpose	Does this topic fit my general purpose (inform / persuade / mark an occasion)?
Audience	Will this audience care, and do they have the background to follow it?
Context	Is this topic appropriate for the occasion, setting, and course assignment?
Time	Can I cover this topic well in the time I have — without rushing or cutting important material?

Apply all four; the topic is ready when all four say yes. A topic that passes three but fails one is not ready.

Illustrative narrowing (walk through it live):
- Broad subject: "technology."
- After purpose filter (inform): "technology and privacy."
- After audience filter (first-year college students): "smartphone privacy settings."
- After time filter (5-min speech): "how to enable two-factor authentication on a smartphone."

That is a five-minute informative speech. The original "technology" could fill a semester.

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Segment 6 — The Model Speech Moment: The Worked Progression (14 min)

Walk through the complete progression on the board — slowly, one step at a time:

Broad topic: nutrition
↓
Narrowed topic: budget meal prep for college students
↓
General purpose: to inform
↓
Specific purpose: "To inform my audience about three strategies for affordable weekly meal prep."
(Check: one idea? ✓ · infinitive phrase? ✓ · audience-centered? ✓ · achievable in 5 min? ✓)
↓
Thesis: "Affordable meal prep comes down to planning around sales, batch cooking, and smart storage."
(Check: full declarative sentence? ✓ · states the main message? ✓ · plain language? ✓)

Land the takeaway: "Notice how each step gets more specific. The topic is the subject; the specific purpose is your goal; the thesis is your message. You cannot skip steps — a thesis without a focused specific purpose usually sprawls; a specific purpose without a thesis gives you a plan but no speech."

Ask students to try one: "On a scrap of paper, pick any subject from your self-inventory and walk the progression. You have 4 minutes. Then we will share two or three out loud." Share and quick-debrief — what flaws came up?

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Segment 7 — Misconceptions + AI-Critique Moment (12 min)

Three misconceptions to cure:

1. ❌ "The thesis can be a question."
   ✅ Cure: A thesis always asserts something; a question does not. "What are the benefits of strength training?" is a research question, not a thesis. Fix: "Strength training improves metabolic health, reduces injury risk, and boosts mood." The audience needs to hear a claim, not a question.

2. ❌ "The topic and the thesis are the same thing."
   ✅ Cure: Topic = the subject ("meal prep"). Thesis = the claim about the subject ("Affordable meal prep saves time and money through three simple strategies"). Every speech has both. A topic without a thesis has no point.

3. ❌ "I will narrow it as I go — I will start broad and cut material during research."
   ✅ Cure: This leads to wasted research time and an unfocused speech. Nail the specific purpose first, stress-test it against the four filters, then research. You will find exactly what you need — not everything that exists.

AI-critique moment:

Ask students: "Try this at home — paste a broad topic into your chatbot and ask: 'Write me a specific purpose statement for a 5-minute informative speech on [topic].' What do you get?"
Common outcome: a specific purpose that is vague, possibly two ideas, probably not tailored to their actual audience. The chatbot does not know the audience's knowledge level, the class context, or the time limit. Its draft is raw material, not a finished plan. Apply the four tests; revise where it fails. The chatbot drafts; you judge.

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Segment 8 — Technology Workflow + Callback & Hand-off (11 min) · Session 2 closes (~75)

Technology workflow — the planning loop for every speech:
1. Self-inventory → choose a broad subject.
2. Apply the four narrowing filters → arrive at a focused topic.
3. Write a specific purpose; stress-test against the four tests.
4. Convert to a thesis; check: full sentence? clear message? plain language?
5. Use the chatbot to brainstorm angles or stress-test the specific purpose — then apply the four tests yourself. Revise where it fails.

Callback + tease:
- Callback: "This week's three-part tool — general purpose, specific purpose, thesis — is the planning layer that sits between having a topic and starting to research. Get it right once and you will use it automatically from here on."
- Tease next week: "Now that you have a topic and a thesis, Week 4 asks the next question: what evidence do I need, how do I find it, and how do I cite it honestly out loud? And — critically — how do I catch the chatbot's fabricated sources before they get into my speech?"

Hand-off (the week's graded work):
- Lecture Tutorial 3 (AI tutor, share-link submission) — the three general purposes, specific purpose formation, and thesis vs. specific purpose.
- Quiz 3 — covers general vs. specific purpose; well-formed vs. flawed specific purpose; thesis as declarative sentence; narrowing.
- Discussion 3 — "Speaker Passion vs. Audience Needs."
- Assignment 3 — two topics, full purpose-thesis progressions, classify-and-fix a flawed specific purpose.
- Speech Workshop 3 — "From Topic to Thesis" — narrow a topic, write all three, self-assess, rehearsal-coach the thesis.

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Instructor FAQ — Common Stumbles

Student says / does	Quick cure
Writes the thesis as a question.	A thesis always asserts — it is always a declarative sentence. Questions are for research; the audience needs a claim.
Confuses topic with thesis.	Topic = the subject. Thesis = the claim about the subject. Every speech needs both.
Writes a specific purpose that covers two ideas.	Split or pick: one specific purpose = one idea. The four-filter tests will catch this every time.
Writes the thesis as an infinitive phrase (confuses it with the specific purpose).	Specific purpose = infinitive phrase (planning tool, NOT spoken). Thesis = full declarative sentence (spoken in the speech).
Starts researching before writing a specific purpose.	Nail the specific purpose first; stress-test it; then research. Fuzzy specific purpose → wasted research time.
Says chatbot can write a specific purpose for them.	The chatbot doesn't know the audience, occasion, or time limit. Its output is raw material; apply the four tests yourself.

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Scope flag

This outline stays within Objective 2 (selecting a topic; the three general purposes; the specific purpose; the thesis / central idea; brainstorming and narrowing). The distinction between informative and persuasive speeches is previewed in the general-purpose discussion but taught fully in Weeks 11 and 12. Outlining and organizational patterns are Week 5 and 6. Research and source citation is Week 4 — this week we plan what to say, not yet what evidence to use. The worked example (meal prep) and the illustrative topics (campus bike parking, sleep, smartphone privacy settings) are original, non-partisan, and non-controversial — appropriate for a public artifact.