Leading language and biased scripts
By Horacio M Pace-Bedetti, PhD, Principal Human Factors Engineer
Question this answers
Why does leading language slip into human factors usability scripts?
Leading language frequently appears in human factors summative protocols because everyday conversational habits naturally contain subtle bias. Practitioners unintentionally transfer these speaking patterns into testing scripts without realising it. Addressing this issue requires actively recognising these linguistic habits, which can be achieved by studying common logical fallacies to prevent biasing participants during testing.
Leading language pops up all the time during FDA reviews of the summative protocol. People often call it out as an issue, but it’s actually harder to spot than most expect. I find that the real trouble starts with how often we all use leading language or subtle bias in daily conversations. These patterns slip into our human factors scripts without us even noticing. It’s not that anyone is trying to steer the results. It just happens, because that’s how people talk.
You can’t fix what you can’t see, so recognizing these habits is the first step. When I was working on my PhD, one of my advisors recommended the book "Logically Fallacious" by Dr. Bo Bennett. That book taught me to recognize so many little ways that language can bias a participant. Since then, it’s been a go-to tool for checking I’m not unintentionally leading participants in one direction or another.
#humanfactors #usability #fda #summative