Staffing involves acquiring, deploying, and retaining a workforce to positively impact an organization. It includes human resource planning, recruitment, selection, orientation, training, performance management, and compensation. Effective staffing considers the person-job match as well as the person-organization match. Staffing models have evolved from simple headcounts to more sophisticated approaches integrating organizational strategy. Key components of nursing staffing include staffing patterns, staffing plans, scheduling approaches like cyclic and self-scheduling, and patient classification systems.