“…For the visualization of the organizational structure and assignments (e.g., users to roles or permissions to roles) in access control systems, primarily node-link representations are used (see e.g., [4], [10], [12], [14], [29]). For example, Harbach and Smith [29] present an approach -called Mind Mesh -which is inspired by the Mind Maps approach [36] to present organizational information like departments/groups, their projects, users, and resources as nodes and their relationships as links. Furthermore, there exist several works that use the well-known node-link diagrams of the Unified Modeling Language (UML) to visualize the specification of the access control models (see e.g., [5], [37], [38], [39], [40]).…”