Prototyping and Testing: What is prototype? Rapid prototype development process, Testing Prototype testing is an essential part of the design and product development process. The way you go about testing your prototype depends on the type of product, where you are in the development process, your goals, and the resources available. But here are some general steps to follow. Before you build your prototype and start testing, you should have a clear idea of what you want to validate. This will help you define the kind of prototype you need. Prototypes can vary in complexity, from low-fidelity sketches to fully functional and interactive prototypes. While low-fidelity prototypes are used for testing out concepts, high-fidelity prototypes are great for testing usability and identifying issues in the workflow.