This portfolio provides an in-depth analysis of performance management and its applications within leadership, training, and talent management contexts, focusing on Nissan as a case study. It explores the operational fundamentals and relevant theoretical models associated with each management area. The research encompasses leadership styles, training methodologies, and talent management practices, offering recommendations for improvement. Specifically, it discusses Nissan's approach to leadership, emphasizing transformational and youth leadership, training programs, including global training centers, and talent management strategies, such as recruitment, performance management, learning and development, and retention. The portfolio concludes by highlighting the interconnectedness of these management areas and their impact on organizational performance, recommending further exploration of collective leadership styles and continuous employee development.