How to find the throughline of a talk

Defines the throughline, the single sentence a talk exists to prove, and gives you a test for everything you might include.

A throughline is the one idea a talk is about, written as a single sentence. Fifteen words or fewer is the default, because the room only carries a line a stranger could repeat. A rare exception exists when every word does work and the room could still say it back.

The throughline is the idea the audience walks out holding. Picture one line running through the talk from first sentence to last, with every scene, fact and moment clipped onto it. Anything that cannot clip onto that line leaves the talk, however much you like it.

The lesson's central distinction is between a throughline and a topic. A topic names the subject of a talk and gives the audience nothing to hold. A throughline states what you want them to believe by the end, so it has a destination and tells you what the talk has to prove. The corridor test checks which one you have. If a listener could tell a colleague afterwards, in one sentence, what your talk was saying, you had a throughline. Once you have it, every possible inclusion faces one test, whether it clips onto the line.

Key ideas.

A throughline is the single idea a talk is about, written as one sentence, fifteen words or fewer by default.
A topic names what a talk is about, and a throughline states what the speaker wants the audience to believe by the end.
The corridor test checks a throughline by asking whether a listener could tell a colleague, in one sentence, what the talk was saying.
Every scene, fact and moment in a talk should clip onto the throughline, and anything that cannot clip on belongs outside the talk.

Questions.

What is a throughline in a speech?

A throughline is the single idea a talk exists to land, written as one sentence. The course From Story to Stage sets fifteen words or fewer as the default, so the audience can repeat it. It is the idea people walk out holding, and every scene, fact and moment in the talk should connect to it. Anything that cannot connect to the throughline leaves the talk.

What is the difference between a topic and a throughline?

A topic names the subject of your talk, and a throughline states what you want the audience to believe by the end. A topic leaves listeners with a vague sense of the area covered. A throughline gives them one sentence they could repeat to a colleague afterwards. If a listener cannot say in one sentence what your talk was saying, you had a topic.

How long should the main message of a presentation be?

Keep it to one sentence of fifteen words or fewer. In the Source Talk Method this sentence is called the throughline. The room carries a line that a stranger could repeat back. The rare exception is a longer line where every word does work and the room could still say it back to you afterwards.

Lesson 2.3 of From Story to Stage, a free written course by Aaron C. Leaman, published by Brighter Future. The terms it uses are defined in the glossary.