Wone mobile is a start up in Tampere trying to design a peer to peer money transfer application between friends. We were tasked to design an interface through user centered design method. The initial phase of the design process started with contextual enquiry and gathering affinity notes. It was followed by creating contextual models. For this app we realized interaction model and sequential model was most descriptive. Affinity notes were arranged to form Affinity diagram. By integrating Affinity diagram and interaction model we created “Activities-Tasks-Interactions” (activity map) flow. This was later used in creating the UED diagram (User Environment Design) and translating it into the User Interface. Personas, Story boards to capture the details and aid the design process.