The adage A picture is worth a thousand words conveys the notion that acomplex concept can be understood with just a single picture. Thus visualisingdata allows users to absorb and use large amounts of data quickly.Although textual programming is widely used, it is not best suited for allsituations. Some of these situations require a graphical way to programdata. This thesis investigates the dierent modeling frameworks available withinthe Eclipse ecosystem that allow the reuse of existing XML schema modelsand the creation as well as editing of diagnostic methods. The chosenframeworks were used to build a graphical editor that allows users to create,edit and use diagnostic methods graphically.