Interviewer training refers to the instruction that survey research interviewers receive at various stages of their employment, and in various ways, to make it more likely that they will perform their jobs effectively. It is absolutely essential for achieving high-quality survey samples, interviews, and resulting data. Organizations that hire people to conduct standardized survey interviews understand that one of the most critical success factors is how well interviewers are trained and managed. The purpose of training interviewers is to teach the principles, skills, and basic procedures needed to conduct telephone or face-to-face interviewing in a manner that achieves high-quality, reliable, and valid information for research.