Paper prototypes, or mock-ups, are used to test early iterations of a design concept. People are asked to represent the prospective users and to perform realistic tasks by interacting with a paper version of the interface. This helps us to test and refine concepts before developing higher fidelity prototypes.

They can be interactive and enable testing of user acceptance by multiple users in various contexts. They may take the form of paper, video, software or three-dimensional prototypes. These representations help to explain the concept vision to various stakeholders – clients, users and colleagues.

Click-through prototypes are usually low/mid fidelity versions of the envisioned solution. They help, among other things, simulate the system responses and test the appropriateness of the interaction flow.

Dynamic, visual, three-dimensional and environmental representations of what a product, service or application may look like. Used to evaluate the initial customer experience or reaction, in-store experiences and to refine aspects of colour and material choices.

They are models or software solutions to demonstrate product or service functionalities
and to test these before committing the project for further development.