The document discusses patient classification systems (PCS), which are tools used to manage nursing staff allocation based on patient care needs. It describes different types of PCS including factor evaluation systems, common care descriptors, and diagnostic-related groups. The purposes and importance of PCS are outlined, noting they help determine staffing needs and standardize nursing practice. Duty rosters, which schedule nursing shifts, are also discussed. Key factors in developing duty rosters include coverage, continuity, flexibility, and cost-effectiveness. Different scheduling approaches like modified work weeks and team rotations are presented.