This thesis compared various e-purchasing systems used by organizations. First, the study aimed to figure out what factors were the most important to companies when picking an e-purchasing purchasing system. Next, the different e-purchasing systems were compared. The level of diversity or consistency of the ratings were checked and the correlation between some of the metrics were evaluated. This comparison will allow companies see what each system is good at and where it might fall short. Lastly, this study also explored how features of organizations like size and industrial sector affects the chosen system as the size of the organization may impact the type of system chosen and the selecting criteria.