A flexible multi-mode undo mechanism for a collaborative modeling environment

Abstract

This paper presents a flexible multi-mode undo mechanism for a collaborative modeling environment supporting different types of graph representations (including Petri Nets and System Dynamics models) as well as free-hand annotations. The undo mechanism is first introduced on a formal basis. It is implemented as an extension of the underlying MatchMaker collaboration server and allows for selecting from and making use of several undo variants with minimal adaptation effort. This is a basis for future usability studies comparing different versions of undo and for better adapting the undo effects to the actual user goals. © 2009 Springer Berlin Heidelberg.