Description 
            of planning domains and problems is the first critical task when using 
            planning technology. VIZ is a lightweight graphical user interface 
            for straightfoward description of planning domains and problems. 
            The interface uses collection of simple diagrams which can be exported 
            directly into PDDL. The user shoud be familiar with logical representation 
            of planning domains and problems, but knowledge of PDDL syntax is 
            not required.
          VIZ was 
            developed at Constraint Satisfaction and Optimisation 
            Research Group (Department of Theoretical Computer Science and 
            Mathematical Logic, Faculty of Mathematics and Physics, Charles University 
            in Prague) as a student's projects by Jindřich Vodrážka  under 
            the supervision of Lukáš Chrpa.
          Please 
            use this reference when referencing the software:
            J. 
            Vodrážka, L. Chrpa: Visual design of planning domains [PDF]
            In Proceedings of KEPS 2010: Workshop on Knowledge Engineering 
            for Planning and Scheduling, ICAPS 2010, Toronto, Canada, 2010, pp. 
            68-69.