: The usability of a computer system can be improved by design of the user interface, and, as importantly, by design of usersystem interactions. Our research presents usability-improving design patterns for different mobile computing client/server-architectures. In mobile computing, different types of client/server-systems exist, because software components can be distributed in different ways. Such general conditions of the architecture affect the pattern collection in a way that requires them to be shaped differently. This "work-in-progress" paper presents first steps towards a pattern system for usability-improving design patterns for mobile client-server computing.