Which key interpersonal skill of a project manager is defined as the strategy of sharing...

According to the PMBOK® Guide (Project Management Body of Knowledge), specifically within the Project Resource Management knowledge area and the Develop Team and Manage Team processes:

Influencing (Option D): This is a key interpersonal skill defined by PMI as the strategy of sharing power and relying on interpersonal skills to convince others to cooperate toward common goals. In many organizational structures (especially matrix organizations), project managers may have little or no direct authority over team members or stakeholders. Therefore, the ability to influence others—by building rapport, exercising ethical persuasion, and demonstrating competence—is essential to gain support and commitment to the project objectives.

Collaboration (Option A): This is a conflict resolution technique (also known as " Problem Solve " ) where parties work together to find a " win-win " solution. While it involves cooperation, it is a method of addressing disagreement rather than the broad power-sharing strategy used to motivate others toward a goal.

Negotiation (Option B): This is the process of reaching an agreement between parties with different interests. While influencing is often used during a negotiation, negotiation is typically more transactional or focused on specific terms (like resource allocation or scope) rather than the general strategy of power-sharing for common goals.

Decision Making (Option C): This refers to the ability to select a course of action from among different alternatives. While a PM must decide how to influence, the act of deciding is a cognitive process, not the interpersonal strategy of convincing others.

In the PMI framework, Influencing is considered a critical competency because it allows the Project Manager to navigate organizational politics and secure the necessary resources and buy-in without relying solely on formal " legitimate " power.