Participation rate measures how many invited participants complete a study relative to the total number approached, and it sits at the heart of research operations planning. A low participation rate can compromise sample representativeness, inflate recruitment costs, and delay timelines, particularly in qualitative research where each completed session carries significant analytical weight. Factors influencing participation rate include study length, topic sensitivity, incentive structure, recruitment channel, and the experience participants have during the session itself. In enterprise research, tracking participation rate across studies helps teams benchmark recruitment efficiency, refine screener design, and identify which participant sources consistently deliver completion. Understanding participation rate is essential for anyone managing research at scale.