FunEuler: an euler diagram based interface enhanced with region-based functionalities

Euler Diagrams are an accessible means of representing non hierarchical set-based relationships which have recently been used in resource management interfaces to facilitate user categorisation. We develop a novel, extensible Euler diagram based interface, called FunEuler, which integrates the concepts of visual classification, spatial arrangements and functional application, thereby greatly extending the power of such Euler diagram based interfaces by enabling fast application of a collection of predefined functions to collections of categorised resources. To demonstrate the principle, we provide several functionalities such as file zipping or creating playlists within the application, whilst also providing a mechanism to extend the functionality to facilitate end user development. Preliminary user testing suggests that the Euler diagram concept is easily comprehensible for resource categorisation purposes, the concept and application of functions can be understood and applied successfully, and that users perceived the addition of functions increased the usefulness of the application for repetitive tasks.