Visual interactive modelling: A pictorial simulation specification system

This paper discusses the use of visual interactive modelling in supporting user–specialist interactions with a research system that takes a pictorial approach in specifying a simulation model. At the heart of the system is a rule-based simulation model interpreter which tracks users' actions via a pictorial interface. This model interpreter works in conjunction with an activity cycle diagram converter, a program generator and a visual simulator to enable seamless integration between the model specification and output results. The system allows a user and/or a specialist to rapidly prototype a simulation model by drawing a picture on the screen in a collaborative manner. The logic of the model is captured by determining the movement of icons on the screen using modelling rules that are built into the system engine. Once the model logic is defined, the user can instantly execute an interactive visual simulation run using the pictorial description of the problem. The use of graphics in discrete-event simulation, the need for a pictorial specification method, a design overview of the system, the experience gained in using such a system, and future research work in this area are discussed in this paper.