Gate5 is a technology company specialising in location-based applications for mobile terminals and the Internet. For the web-based part of Gate5's product family, preview developed an interface concept that allows the configurations to be tailored exactly to the respective product. On the basis of this system, pReview developed the interfaces for four Web-based applications and one mobile application. The interface system enables new applications to be designed, and existing applications to be expanded, based on a building block principle.