Planning towards succession in Harry Potter and the Half-Blood Prince?

This book in the Harry Potter series brings to fore situations experienced by leaders in organizations. Themes such as trust, deceit, envy, and hatred are reflected in the thrilling suspense-filled pages which now bear the hallmark of J.K. Rowling's creativity. More interestingly, Harry Potter appears to figure in Professor Dumbledore's succession plan because Dumbledore lets Harry into his past and transfers some of his knowledge to him through the Pensieve - that wonderful invention of J.K. Rowling....