This document discusses the end-to-end lifecycle in human resources, known as Hire to Retire (HTR). It provides lists of typical events from a business and employee perspective throughout an employee's tenure. These include recruitment, performance management, family changes, compensation adjustments, and leaving the organization. The document also outlines the various sub-modules within an HR system like SAP, including personnel administration, learning management, payroll, and benefits administration. It notes that HR systems interact with other core modules like finance and may require customization to meet an organization's specific needs.