Abstract
User Interface (UI) plays a critical role to a successful product, since UI provides the first impression to users when they use the product. UI will directly affect the experience of customers, and then influence the satisfaction of the product. Despite an interface includes a large amount of information and complex processes, the current interface design method rarely concerns about the aspects of the process and information capacity. This results in bad accessibility. In addition, the existing usability methods fail to customize criteria for different types of the interface. Therefore, this study proposed an IDEF (ICAM DEFinition Language) based interface design method along with a customized usability test method which is called ANP(Analytic Network Process) to calculate the weights of usability metrics so as to better assess the designed interfaces. A case study of IOT(Internet of Things) platform website UI will be provided to demonstrate the advantage of the proposed method, which can reduce the development time of UI and improve user satisfaction.