Reader style: casual audience
How the presentation principles change for a room that chose to come and can leave. It has three parts: who the listener is, the overrides, and what is open.
Who
- Listener: someone at a meetup, a club, a lightning-talk evening, a popular-science talk, or among friends and classmates; what a casual talk is, is set out in the review, section 10.
- Expertise: none assumed; the room is lay or mixed.
- Medium: a room, often small, with slides or without.
- Reading mode: listening by choice, with the freedom to stop.
Overrides
No study measures a live casual talk, so most rows below are conventions; each keeps its grade. Everything else in the principles holds, the claim headline and legibility in the room included.
| Principle | Change | Why |
|---|---|---|
| Define before use | strengthen: assume no prior knowledge. Say who the talk is for, define every term before its first use, and prefer a plain word to a technical one | McCarthy 2025 (the audience is seldom defined); Rakedzon 2017 (lay summaries still above the jargon limit). Supported with caveat; no source tests assuming none |
| A talk is not a paper | change: open with why a non-specialist should care, in the first minute, before any background | Childers 2021 (attendees came for learning and company). Convention, untested |
| A talk is not a paper | change: in a slot of 3 to 10 minutes, a hard limit, give one idea and no plan slide; the point is said at the start and at the end. A deck declares its slot (<html data-minutes="5">), and the talk-structure check then asks for no plan |
Bakcek 2020 (equal test scores in a short format); competition rules and guides, all examples. Convention, untested |
| (evidence) | add: a story may carry the content for a lay room: a person, a problem, what happened | Dahlstrom 2014; Zebregs 2015 (health only). Supported with caveat |
| (content) | allow humour or an anecdote only when it is tied to the point; cut unrelated humour like any detail | Zhou 2025 (perceived learning, rapport); Garner 2006 (one experiment: related humour raised recall); Sundararajan 2020. Supported with caveat: affect is clear, learning mixed |
| Claim headline with evidence | relax: slides are optional, none, one or a few; when there are slides, their rules hold | Baker 2018 (slides neutral on average). Measured for "neutral on average"; convention for none |
| Motion adds, never replaces | keep, and say the risk: a live demo is a choice, with a recorded fallback | Shah 2023 (live code taught no more than static code); guides disagree, all examples. Convention |
| Plan the questions | change: in a small room, questions may come during the talk, as discussion; the speaker repeats each question | Hunsu 2016 (classes; the questions, not the device, carry the gain); guides, examples. Supported with caveat for classes; convention for talks |
Thresholds
Unchanged. A casual room still has a back row, so type size and contrast hold.
Open questions
- Whether any of these overrides changes what a casual audience understands or keeps: no study of a live casual talk with a measured outcome was found.
- Whether one idea in a short slot is understood better than two, or only easier to give.
- Whether questions during the talk help the room or only the speaker.