Decision-making skills impact success in the UPSC Interview by allowing candidates to demonstrate analytical thinking and problem-solving abilities. Effective decision-making showcases a candidate's ability to evaluate situations, weigh options, and arrive at rational conclusions. During interviews, when faced with hypothetical scenarios, candidates with strong decision-making skills can articulate their thought processes clearly, impressing the panel. This capacity not only reflects aptitude but also signifies readiness for the responsibilities that come with a career in public service.