Theatre that incorporates the words of real people
Verbatim theatre, as Will Hammond and Dan Steward point out in their excellent book on the subject, is not a form but a technique: a way of incorporating the words of real people, as spoken in private interview or public record, into drama.
more here:
https://www.theguardian.com/stage/2012/may/08/michael-billington-verbatim-theatre