Final answer:
A scaffold should be erected, moved, dismantled, or altered under the direction of a trained supervisor to ensure safety and compliance with regulations. In theatre, related roles focus on safety, with the technical director overseeing set building and ensuring safety.
Step-by-step explanation:
Scaffolds should be erected, moved, dismantled, or altered only under the supervision and direction of a trained supervisor. This is to ensure the safety and structural integrity of the scaffold, and to comply with safety regulations. While a qualified engineer, a licensed contractor, or a certified worker may also possess the necessary skills, it is typically the responsibility of a trained supervisor to oversee such operations. The trained supervisor generally has extensive knowledge of safety standards and experience in scaffolding and work site management.
In the context of theatre production, similar rigorous standards apply to ensure the safety of all crew and performers. The technical director is the person in charge of building the set and ensuring the safety of the production, similar to how a trained supervisor oversees scaffold construction. In any situation where safety is a concern, individuals with appropriate training and authority are required to supervise technical operations.