A project is underway at Southampton University to create a software analysis tool, DAMAGE, dedicated to modelling debris in High Earth orbits over the long-term. The DAMAGE project aims to account for the unique characteristics involved in modelling the GEO environment. Applications of the model include investigation of mitigation methods for GEO. This work will inevitably require novel solutions if the precision and speed of the software are not to be compromised. This paper presents a preliminary framework for the dedicated GEO debris model DAMAGE and discusses the challenges of GEO modelling in this context.