The purpose of these models was to provide a greater understanding of the resource and planning implications of criminal justice policy. Most had been developed using widely available software packages that demonstrated the importance of innovative thinking over technical sophistication. The United Kingdom models and the software used to produce them were Flows & Costs model (Microsoft Excel with Visual Basic for Applications and Crystal Ball); Long-term Prison Population Projection model (Visual C++); and Trends in Property Crime (Eviews). Western Australia contributed Short-, Medium-, and Long-term Prison Population Projection models (Microsoft Excel with Visual Basic for Applications, Arena Business Additions, Microsoft Excel). The Washington State Institute designed a Criminal Justice Cost-Benefit model (Microsoft Excel with Visual Basic for Applications and @ Risk). Figures, references