Hierarchy and expected response may inhibit someone from speaking up about a safety concern. This study used two vignettes of a speaking up situation with randomization on speaker seniority, discipline (i.e., allied staff, nurse, physician), tone (i.e., accommodating or non-accommodating), and the presence of other people in the room. All participants were more likely to respond positively to the accommodating tone, but the impact of seniority varied by receiver's discipline.