A staffing model considers factors like organization size, industry, workforce demographics and business objectives to determine appropriate staffing levels and employee types. It involves evaluating goals, identifying factors affecting the model, analyzing the current state, developing a solution, recruiting accordingly, prioritizing retention. Common factors to consider are job requirements, goals/culture, budget, workload, future growth, recruitment channels, training. Staffing includes recruitment from internal and external sources, selection through application screening, testing, interviews, and hiring the best candidates.