Final answer:
The main duty of planning, organizing, leading, and controlling a project efficiently and effectively falls on the Project Manager.
Step-by-step explanation:
Answer:
The main duty of planning, organizing, leading, and controlling a project efficiently and effectively falls on the Project Manager.
A Project Manager is responsible for overseeing the entire project lifecycle, from initiation to closure. They develop project plans, allocate resources, coordinate activities, provide leadership to the project team, and ensure that the project is executed according to the defined objectives and constraints.
Other roles mentioned in the question, such as Construction Manager, Design Manager, and Planning Engineer, may also have responsibilities related to specific aspects of the project, but the overall responsibility of planning, organizing, leading, and controlling the project lies with the Project Manager.