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Tracks›Slides & Pitch Decks
L3Lesson 26Free

Fact-check claims and numbers

Sources, dates, and assumptions

After this, you'll be able to create a fact-check log and use it to move a deck from rough material toward a presentable file.

Before you start

Complete Create the email follow-up version first.

The idea

A deck needs a fact-check pass before it is used to make decisions or promises. This lesson asks you to make a fact-check log, not a prettier version of scattered notes. The output should be specific enough that someone could open the deck file and see what changed.

Numbers and claims look finished before they are reviewed.
The first move: turn the lesson input into a fact-check log.

Here is the before and after: Before, numbers and claims are trusted because they made it into the deck. After, each claim has a source, date, owner, and status. For example, if you are preparing a sales presentation, the artifact should name the audience, slide job, proof, speaker note, or export check where that detail matters. A reviewer should be able to tell whether the deck is closer to being presented, sent, or handed off.

Now try it: Build a fact-check log from the deck and mark each item verified, needs source, outdated, or remove. Make one choice before asking Claude to write: which audience, which decision, which proof, which slide job, or which delivery mode matters most right now. That choice keeps the deck from becoming a generic presentation outline.

Fact-check claims and numbers runtime mapThe deck works when a fact-check log connects the input, the check, and the next step.
Messy inputThe raw pitch deck material before the lesson shapes it.
a fact-check logThe thing you can inspect, edit, and reuse.
1Review checkThe delivery check that catches a weak assumption.
Next stepThe output moves into the next lesson instead of sitting alone.

The lesson is done when the artifact moves the deck toward a real room, reader, or file handoff.

Try it (16 min)

Watch out for

  • Checking numbers but skipping qualitative claims.
  • Using old stats without dates.
  • Letting unsupported claims stay because they sound good.

Paste this into Claude

Create a fact-check log for this deck. Extract claims, numbers, customer quotes, market statements, and promises. Return Claim, Slide, Source, Date, Owner, Status, Risk, and Fix. Deck: [paste].

If any input is missing, ask me up to three questions before producing the artifact. Then return five sections: Finished Artifact, Realistic Deck Example, Assumptions To Check, What I Should Use In The Next Lesson, and One Risk If I Present Or Send This Without Fixing It. Keep the answer practical enough that I can paste it into my deck working doc.

Created by potrace 1.16, written by Peter Selinger 2001-2019 What a good response looks like

Finished Artifact:
- a fact-check log
- Why it matters: it gives the deck a concrete thing to inspect instead of a vague intention.
- Use it next: paste this artifact into the next lesson before asking Claude to write, build, import, publish, or review anything.

Reality Check:
- The artifact names the user, input, decision, owner, or proof it depends on.
- The weakest assumption is visible.
- The next step can be completed in one sitting.

Created by potrace 1.16, written by Peter Selinger 2001-2019 What good looks like

  • Claims and numbers are extracted.
  • Each item has a source or missing-source label.
  • Dates and owners are included.
  • Risky claims have a fix.

Created by potrace 1.16, written by Peter Selinger 2001-2019 Go deeper (8 min)

Paste this into Claude

Without rereading the lesson, explain why a fact-check log matters in three bullets. Then apply it to a second deck example: [describe a different audience, room, or topic]. Return What Changed, What Stayed The Same, What To Check Before Presenting Or Sending, and the exact next action.

Created by potrace 1.16, written by Peter Selinger 2001-2019 What a good response looks like

Transfer Check:
- What changed: the second example has a different audience, input, or delivery context.
- What stayed the same: a fact-check log still needs a source, a review check, and a next step.
- Before trusting it: inspect the delivery check that would catch a wrong assumption.
- Next action: run the check once, then carry the revised artifact into the next lesson.

Created by potrace 1.16, written by Peter Selinger 2001-2019 What good looks like

  • You explained the lesson idea from memory before applying it again.
  • The second example changes the artifact instead of copying the first answer.
  • The delivery check names a real risk.
  • The next action can be done in one sitting.

When this breaks

  • Breaks when unsupported claims enter the room because trust drops under questions.
  • Fails when dates are missing because old facts look current.

AI can help with this

Paste the exercise prompt into Claude with your real deck context. Ask Claude to interview you one question at a time, produce a fact-check log, challenge the weakest assumption, and rewrite the artifact once so it is ready for the next deck step.

A fact review log sits under the claims and separates confirmed, uncertain, and removed items.

Created by potrace 1.16, written by Peter Selinger 2001-2019 You can now

✓

You can explain a fact-check log in one sentence.

  • ✓You can name the source material or decision it depends on.
  • ✓You can name the assumption that still needs checking.
  • ✓You can point to the check that proves it is ready for the next deck step.

Key takeaways

Fact-checking protects the audience, the presenter, and the decision the deck is trying to earn.

  1. 1Claims need sources.
  2. 2Dates matter.
  3. 3Qualitative claims need review too.
  4. 4Unsupported claims should change or leave.

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Create the email follow-up versionHand off source files and notes
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