With a customer who has agreed to help, prepare the interview, then turn their words and the figures they supply into a case study in a short and a long version. Every quotation and number is listed for the customer to approve in writing, and nothing is published or named before they do.
A coach, trainer or consultant hands over transcripts of recent sessions and gets back article drafts in their own words: the subjects they actually taught, their key lines quoted word for word, no participant named, and a review sheet of what to check before publishing.