What is the primary responsibility of a project manager?

The primary responsibility of a project manager encompasses the comprehensive phases of a project lifecycle, which includes planning, executing, and closing project activities. This multifaceted role requires a project manager to not only outline the project's scope, objectives, and timeline during the planning phase but also to implement and monitor these plans throughout the execution phase. The closing phase involves delivering the completed project and ensuring that all activities are concluded effectively and any lessons learned are documented.

By overseeing all these aspects, the project manager ensures that the project meets its goals within the constraints of time, budget, and quality. This holistic responsibility is essential for achieving project success and satisfying stakeholder expectations, making it clear why this choice accurately reflects the core duties of a project manager.