Sample wireframes, mockups, and prototypes
"One of usability’s most hard-earned lessons is that you are not the user. This is why it’s a disaster to guess at the users’ needs. Since designers are so different from the majority of the target audience, it’s not just irrelevant what you like or what you think is easy to use — it’s often misleading to rely on such personal preferences." The Distribution of Users’ Computer Skills: Worse Than You Think - Jakob Nielsen, Nielsen Norman Group, nngroup.com
User-centered design you count on.