In order to successfully conduct user-centered-design projects, it is important for the team to have a shared vocabulary and understanding of key concepts. Grave misunderstandings can occur, when the parties involved use identical terminology, but the concepts that they refer to diverge. This starts with terms like “usability” or “user experience”, for which – in the worst case – you can find as many different explanations as there are members on the project team. Confusion can also arise regarding the concept of “interaction design”.