How do I respond to stress questions in a job interview?

Stress questions like 'Why should we hire you and not the other candidate?' primarily test stress resistance and self-assessment according to OPM research — not answer quality. Three proven rules: First, a brief pause is professional — 2-3 seconds of thinking appears composed, not uncertain. Second, answer directly rather than deflecting with counter-questions. Third, maintain control — 'That is a good question' as a buffer is better than silence. For failure questions: Name a real but non-job-critical mistake, explain briefly and emphasise the learning outcome. ISO 10667 shows: Interviewers who ask stress questions are looking for growth orientation and resilience — not flawless candidates.