The document outlines the evolution of the human resource function from a business function focused on administrative tasks like payroll and record keeping, to a business partner focused on communication, compensation, and employee development, and finally to a strategic partner that aligns employees and business objectives and measures leadership effectiveness. It shows how the focus and responsibilities of HR have changed at each stage, along with notable changes in tools used from basic spreadsheets and timekeeping systems to more advanced applicant tracking, learning management, and performance systems.