Prototype testing is a great way to test a design or concept that is not finished. A fleshed-out, completely linked prototype is not necessary for testing. We suggest starting the testing as soon as you have a rough mock-up of an idea. Then continue to test as you revise your prototype. We find that getting user feedback early and often helps to ensure a successful site or app launch. Users' prototype can range from a static image to a less than fully functional prototype of an app or site, and can easily be shared with contributors through a prototype test or by linking to the content via a URL link. Once the prototype is ready, you’ll then determine which research methodology will be best for your test.