How do I mark overlapping speech so readers can follow both speakers?

Keep each speaker’s words on a separate, consistently labeled line, and add an explicit marker where the overlap happens. For example, define [OVERLAP begins] and [OVERLAP ends] in a short note at the start of the transcript. This is a practical house-style choice, not a universal rule. A Library of Congress-hosted transcription guide uses a “little hook” to mark the beginning of overlap, but that convention belongs to that guide; use it only if it suits your project and explain it to readers. [S1]

For instance, in this hypothetical example:

Maya: I thought we could— [OVERLAP begins] Lee: The room is booked. Maya: —move it to Friday. [OVERLAP ends]

The marker makes the shared moment visible while the labels keep the words attributed. If your notation cannot show exactly where the overlap starts or stops, use a simpler label such as [Maya and Lee speak at once] rather than suggesting more timing detail than you have.

Preserve an overlap when its timing helps readers understand the exchange—for example, when one person cuts in, both respond at once, or the interruption matters. If exact timing is not important and the transcript becomes hard to follow, you can present the turns in a simpler sequence, but avoid making simultaneous words look like one speaker waited for the other if that changes the meaning.

A useful test is: would separating these turns change how a reader understands the interruption, response, or disagreement? If yes, show the overlap. If no, prioritize readable speaker-by-speaker formatting and explain any editing convention you use. Keep speaker labels consistent throughout; the Library of Congress Veterans History Project advises consistent speaker identification and reproducing words closely while keeping the transcript understandable. [S2]

Do not reconstruct a phrase just because it seems likely. Keep any words you can confidently distinguish under the right speaker, and label the part you cannot make out—for example, [overlapping speech, unintelligible] or [inaudible]. Choose a label that accurately reflects what you can tell, then use it consistently.

The Veterans History Project recommends identifying garbled or inaudible portions and gives question marks around a word or phrase as one way to mark uncertainty. [S2] That guidance supports being transparent about unclear speech; it does not prescribe a notation for overlapping speakers. Your project can define its own clear marker. For example, [Maya: I thought we could…; Lee: overlapping speech, unintelligible] is a possible placeholder format, not a claim about what anyone actually said.

Yes. Put a brief notation key near the beginning, apply it consistently, and don’t use a special symbol without defining it. Here is a copyable starting point you can adapt:

[OVERLAP begins] = two or more speakers talk at the same time. [OVERLAP ends] = the simultaneous speech has ended. [inaudible] = speech is present but cannot be made out.

If you can identify only part of a phrase, preserve the distinguishable words and mark the unclear portion rather than completing it. The cited guidance does not establish one mandatory overlap format, nor does it settle how much overlap a particular project should retain. Choose a notation that fits your transcript’s style and makes clear what you know—and what you cannot tell.