A recognition that computer-based tools communicate mental models among developers, users and other stakeholders, thereby placing constraints on the use of those tools, is important to understanding the use of technology. In our work in computer-based simulation modelling, the realisation that technology can both impose constraints and provide possibilities has been a constant concern.

Computer-based simulation models aid the process of formulating a problem. Such models can act as “dynamic intermediaries” which facilitate the ebb and flow of understanding among stakeholders. This facilitation effect leads to a particular view of the role of technology in decision support. It has enabled us to develop software which improves the process of communicating problem understandings. This chapter describes the use and theoretical foundations of computer-based tools we have developed to support simulation modelling.