Successful or failed software projects have been discussed in literature for many years. Successful software projects are often defined as meeting business objectives, deliver on time and within budget, and meeting requirements. Different factors that contribute to software project success have been identified in the literature. Some of the most common factors that lead to software project success are: user involvement, management support, realistic requirements, and having good estimations. However, there are different opinions about what a successful software project is. Linberg found in a study that managers had a different perception from software practitioners (developers, testers etc.) about what a successful software project is. Since there are different perceptions of what a successful project is among different roles in software development, there may be differences from other perspectives too. This observation relates to the overall research questions in the thesis: Could there be different perceptions about what success factors are for software projects among different countries and customer-supplier relationships? Do people from different countries have different perceptions about what success factors are for software products? This study investigated if there are any differences and similarities between Swedish and Australian companies. In addition, a comparison between bespoke and market driven and bespoke and in-house customer-supplier relationships was made. The result shows that there are differences of which factors that lead to software project success among the two countries as well as between different types of customer-supplier relationships.