Final answer:
The major portion of the physical and mental project work is performed in the Executing stage of a project.
Step-by-step explanation:
The major portion of the physical and mental project work is performed in the Executing stage of a project. This is the stage where the plans and designs are put into action, and the project is carried out according to the defined objectives and criteria. In the context of a project life cycle, the major portion of the physical and mental project work is typically performed during the Executing stage. This stage is where the design that has been conceptualized, defined, and planned is brought to life. During the Executing stage, physical models or prototypes might be built, design architecture is determined, and detailed design is developed to the extent that prototypes can be made. Implementation can include various activities like creating drawings, building models, painting elevations, or constructing scenery. This phase requires designers to be flexible and willing to evolve as the production progresses. Previous stages, such as conceptualizing or defining, involve exploring possibilities, generating ideas through brainstorming, and refining the preliminary design. However, it is in the Executing stage where these ideas are put into motion and the portion of work to physically realize the project takes place. It is also crucial for the success of the project that the detailed design is accurate and effective, as this has a significant impact on the project's overall quality.