Personnel records and reports enable managers to obtain information about human resource usage across departments. Effective record keeping requires principles like justification, verification, classification, availability of needed information, and reasonable cost. Personnel records are significant for functions like reviewing policies, supplying agency information, succession planning, conducting research, and identifying training needs. Personnel audit systematically evaluates personnel programs, policies, and practices to identify gaps and determine future actions. Personnel research investigates human resource management aspects through methods like surveys, statistics, and case studies to improve programs and activities.