It is a challenge to work in a software development project. People with different backgrounds are together working towards the goal of delivering a run able piece of software. The influences to the design are many and all of them will affect how the program will be designed. During this spring we have been involved in a large software engineering project. Our part of the project has been focusing on interface design and using the design method persona. In this bachelor thesis we describe our experiences of participating in a software development project. We will explain how our design work was affected by the organisation of the project and how we have worked with adjusting the method of persona to the conditions given in the project. We will also describe the importance of communicating the design within the project. The main purpose of the report is to show how we during the project have become aware of the importance of tracing design decisions back to its origin. Many attributes has come to inform our design and this has made us aware of the importance of having a traceability of our work.