When creating software, people from many different areas are involved. To make them work efficiently together they need to communicate but communication requires a common language and common understanding. The Unified Modeling Language (UML) is often used as a common ground for understanding when modeling and designing software products. However, after practically working with many large projects we have found UML to have shortcomings in the area of modeling Graphical User Interface (GUI). There are many other ways to model GUIs but it could be beneficial to use a modeling method that the more technical developers are familiar with and also beneficial to be able to put in the interface into the framework of UML when it comes to drawing applications and code generation. In this study we first of all have investigated the possibility of adding GUI design to UML and then we have explored different solutions for what a GUI UML-diagram could look like and what problems there are with diagrams when it comes to visualizing objects. We have then put forward an idea for a GUI diagram or an UML extension; a graphical element diagram, and discussed its benefits and drawbacks. © 2009 IADIS.