The awareness of design for ISO 13407 in product planning phase increases usability testing of digital devices at early stage in development process is strongly needed. In development process, various mock-ups are made and applied to usability testing. But, existing taock-ups are not enough to assess the usability of user interface, because they don't enable us to assess the usability from cognitive and physical aspects simultaneously. To solve these problems, we proposed the fusion of virtual and physical mock-ups by using RFID embedded interface and applied it to usability testing for digital devices.