The document discusses different types of interviews and factors that affect their usefulness. It describes selection, appraisal, exit, and data collection interviews. Structured interviews follow a set sequence of questions, while unstructured interviews are more conversational. Situational, behavioral, and job-related interviews focus on how candidates would or have handled certain situations. The document also lists factors like first impressions, misunderstanding the job, and personal characteristics that can influence interviews. It provides guidelines for effective interviews, such as preparing questions based on job duties and using the same questions for all candidates.