In the course of their work, sign language interpreters are faced with ethical dilemmas that require prioritizing competing moral beliefs and views on professional practice. There are several decision-making models, however, little research has been done on how sign language interpreters learn to identify and make ethical decisions. Through surveys and interviews on ethical decision-making, this study investigates how expert and novice interpreters discuss their ethical decision-making processes and prioritize prima facie duties, also called meta-ethical principles (Ross 2001). The survey participants included 225 novice interpreters who have three or fewer years experience as a nationally certified interpreter, and 168 expert interpreters ...