The IOS Adoption Motivation (IAM) model is a theoretical framework that relates organisational motivations for IOS adoption to IOS adoption processes. The IAM model which was tested in the Australian pharmaceutical industry however requires additional validation. We have thus applied the IAM model to understand IOS adoption processes of a supplier that operates in the Australian automotive industry. Interesting variations in the IOS adoption processes between two stages of EDI adoption were observed which are explained in terms of the model. The findings provide broad support for the IAM model, and will be useful to IT managers responsible for managing IOS.