Final answer:
Quality is the element that is not part of the project management triangle's traditional components, which are Time, Cost, and Scope. Quality is influenced by changes to these elements and is assessed through various methods including testing and customer feedback.
Step-by-step explanation:
The element of the project management triangle that is not listed is Quality. The traditional project management triangle consists of three main components: Time, Cost, and Scope. These elements are often referred to as the 'triple constraints' of a project. Quality, while an essential aspect of project management, is typically represented as a central factor that is influenced by changes to time, cost, and scope, but is not traditionally one of the triangle's vertices.
To evaluate the quality of a design, engineers often focus on the attributes of the product. If prototypes were not tested adequately, it might suggest a lapse in the quality evaluation process. Methods such as peer reviews, testing, and customer feedback are used to ensure a design meets certain standards and functions as intended.