Final answer:
A contractor is the individual who decides on the methods used to complete contracted work, involving both mental and physical labor similar to professions like surgery.
Step-by-step explanation:
The individual who chooses the method to use in completing contracted work is typically a contractor. Contractors are responsible for providing the labor needed to complete projects, which includes both the planning and the physical construction. The terms of the contract between the contractor and the client usually allow the contractor the discretion to determine the specific methods and processes to be used in fulfilling the work to the required standards, as long as they are within building codes and regulations.
In this scenario, contractors utilize a combination of mental and physical labor, requiring skills similar to other professions that blend cognitive and manual expertise, such as surgeons. Mental labor includes tasks like organizing blueprints and ensuring compliance with regulations, while physical labor involves the construction activities themselves.