Which of the following is not a key skill for effective personnel management?

Coding proficiency is not considered a key skill for effective personnel management because personnel management primarily focuses on interacting with people, managing team dynamics, and ensuring organizational effectiveness. Key skills such as conflict resolution, leadership, and clear communication are essential in this context, as they enable a manager to navigate interpersonal challenges, inspire and guide their team, and convey information and expectations clearly. While technical skills like coding can be useful in specific roles or industries, they do not directly contribute to the fundamental responsibilities of managing personnel. In contrast, the other options directly pertain to successful leadership and the ability to maintain a harmonious and productive work environment.