Human-centered adaptation has been subject of research and development for more than two decades. In particular adaptive learning systems built the foundation of this research area. Content-based adaptation, navigation support, and help-systems are just example for the broad range of adaptive hypermedia and learning systems. The developed approaches commonly focus on users’ knowledge in a particular domain of interest, e.g. teaching programming languages. In contrast to those systems, adaptive visualizations are a relatively young area of research. Although the main goal, namely to support users in information and knowledge acquisition processes is quite similar, a linear way of learning is not focused in adaptive visualizations. Visual environments contain various variables that can be adapted and thereby support or confuse users.