Introduction to Engineering Design (IED) EOC Practice Test 2026 – Your All-In-One Guide to Exam Success!

The main idea being tested is using a full-size, functioning version of a design to observe how it performs and to make real-world adjustments. This is described by the term prototype. A prototype is built to test the design concept in actual operation, allowing you to observe performance, identify issues, and refine the solution before final production. It goes beyond a simple model by not only representing the idea but working it out in practice. In contrast, a model may be a non-working or scaled representation used to study structure or appearance; calipers are tools for precise measurement; and a portfolio is a collection of work samples for presentation, not for testing how a design functions.