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...e able to implement them in a conceptually clean way. A metamodel for a very specific purpose may be very precise. However, as requirements change, such a precise metamodel may turn out to be inflexible and not well suited for extension. On the other side, too many predefined extension points increase the complexity of the metamodel. Making a metamodel too general makes it too abstract, which impedes its use- and reusability. The extensibility trade-off is a challenge for all evolution types. 4 Palladio Component Model In our research group, we face the challenges of evolution and maintenance [14, 13] of the Palladio Component Model (PCM) [1]. We present this case as a concrete example. However, most insights in this paper are applicable to metamodel-centric software systems in general. The PCM is a modeling language (defined by a metamodel) to describe component architectures of software systems. It is the centerpiece of the Palladio Approach [1]. The PCM is modeled in Ecore. In the versioning system, its files can be traced back to 2006. There are editors for the PCM as a graphical notation. Several simulations and analyses exist, which operate on PCM models. Most of them perform perform...