CliSeAu for Android Applications: Design, Case Studies, and Evaluation. CliSeAu is a tool for dynamically enforcing runtime policies for Java programs in a decentralized and distributed fashion. The goal of this Master Thesis is to extend CliSeAu so that it can also be used to enforce runtime policies in Android applications. While Android is based on Java, it introduces some new aspects that are platform specific and has a different format for executable applications than plain Java. The developed extension should provide an accessible interface to Android's peculiarities like the Application life-cycle and interprocess communication model. Also, it should allow for fast enforcement during program runtime. The performance of the instrumentation will be evaluated using empirical analyses. The focus of this talk is the presentation of the core challenges of the thesis and key results of the first evaluations. These include the runtime overhead of the intermediate implementation results as well as insights gained regarding the design of a robust evaluation system. I will show that CliSeAu users do not need to handle life-cycle callbacks if the desired policy does not require it but can easily access them otherwise. Finally, I will also provide an outlook on the main concepts that are still to be designed and implemented.