The EvoSpaces reverse-engineering tool represents the architecture and metrics of complex software systems as 3D software cities. By navigating and interacting with this world, the user will quickly get a global idea of the system, and then by a deeper exploration of the 3D world, learn how specific elements are linked together and which components are involved in a specific task. EvoSpaces then represents both the static elements of the software as well as its dynamics using the same City metaphor.