The Usability Engineering Repository (UsER) is a tool system designed and implemented in prototypical state to support the analysis, design and evaluation of interactive systems. For this purpose, UsER provides method modules covering different aspects of analysis, design, implementation and evaluation. While created in a linear, document-like structure, contents can be interlinked in order to point out semantic interrelationships, ease navigation and allow tracing requirements forward and backward in the process. The modules can be configured and used as needed and none of them is mandatory. We will introduce UsER using the Human-Centered Design (HCD) Process as example. © Gessellschaft für Informatik, Bonn 2014.