Abstract: Today's knowledge workers have access to practically endless amounts of information resources. However, this information alone is of no use if it cannot be reasonably retrieved and organized. Today's software solutions are a collection of heterogeneous, inconsistent, separate environments that are not optimized for efficiency in the higher workflows typical of knowledge work. visuos™ is a concept for an operating software for knowledge work. It covers various forms of access to knowledge spaces, including knowledge management, information retrieval, research and refinement, monitoring of knowledge resources, and automation and scheduling of tasks. It is a system designed for a broad target group – from novice to expert. Its modular structure allows users to adapt the system to their particular degree of experience and the individual form of access to knowledge spaces desired. The modules are integrated by a holistic conceptual model. This model was designed in order to allow effective workflows with minimum friction. The benefits of the system include improved functionality, new workflows, a maximized target group, higher efficiency and productivity, and a higher degree of user confidence.