This paper presents an analysis of the degree to which attitudes towards an Internet-based simulation depend on how satisfied participants are with the software used. The theoretical model also specifies how the individual characteristics of the participants also may have an impact on user satisfaction and general attitudes towards Internet-based simulations. The research shows that the individual characteristics focused on in this study (sex, age and computer knowledge) do not have any impact on user satisfaction, nor do they have an impact on attitudes towards the Internet-based simulation used. This study was conducted over four years (from 1998 until 2001) and the research shows an improvement in user satisfaction over these years. The evidence is inconclusive with respect to changes in attitudes towards the Internet-based simulation over these four years, though. Experimental research may be needed in order to assess the effects of changes in software and infrastructure on user s...