This document is the preface and introduction to the 4th edition of the book "Performance Management" by Herman Aguinis. It discusses how in today's globalized world, technological and product differentiation is no longer a key competitive advantage for most companies. Rather, having engaged and talented employees who can offer outstanding customer service has become the main source of competitive advantage, referred to as "human capital." Performance management systems are seen as key tools for transforming employees' talent and motivation into a strategic business advantage. However, many performance management systems are not living up to their promise, with a global survey finding that only 27% of employees believe their company's performance management process is effective. The introduction sets up the importance and goals of the