Eight-second test
The eight-second test is a slide-level check:
If the audience looks at this slide for eight seconds, can they leave with the main message?
Most slides are looked at, not read. The audience scans, lands on something, then returns to the speaker. If the slide does not deliver the message in that scan, the speaker has to deliver it — and many decks travel without their speaker.
How to run it
- Open the slide cold.
- Count to eight.
- Look away.
- Ask: what do I now know?
If the answer is the action title restated as understanding, the slide passes. If the answer is "nothing yet, I need to read it" — fail.
What it catches
- Action title doing no work. A title that names the topic instead of the insight.
- Wrong focal point. The eye lands on the wrong component (the source note, a sub-heading, a chart axis).
- Density without hierarchy. Everything equally weighted; the eye gives up.
- Two-message slides. Two roughly-equal-sized blocks competing for focal point.
- Hidden message. Insight buried in a callout three reading-orders deep.
Tools to pass it
- One focal point per slide. The biggest, brightest, or most-isolated component is what the eye lands on. Make sure that is the message.
- Action title carries the message even alone. If the action title is the message, the slide can fail at every other level and still pass the test.
- Visual hierarchy. Size, weight, contrast, isolation. Use them to direct the eye.
- Aggressive cutting. Components that do not serve the focal point compete with it.
Eight-second × forward × headline
Three tests, same family:
- Eight-second test: does this slide survive a glance?
- Headline test: does the deck survive a skim of all titles?
- Forward test: does the deck survive being forwarded to a sceptic?
A slide that passes all three is a slide that earns its place in any of the deck's afterlives.
Canonical phrasing
The audience gives every slide eight seconds before they decide whether to keep reading. Earn the next eight.