Job analysis is the process of systematically determining the essential components of a job including duties, skills, and qualifications. This information is gathered through interviews, observations, and questionnaires. A job description outlines key details like title, responsibilities, requirements, and compensation. Job specifications list needed qualifications like education, experience, skills, and traits. Rank classification systems classify employees based on rank, while position classification systems classify roles based on duties. Job analysis informs recruitment, selection, training, and performance evaluation.