This research has investigated a broad range of issues associated with the use of mobile information systems in Australian utility companies. In particular, special consideration has been given to the existing infrastructure, business processes and information systems used in the participating organisations to support its field workers. This research has used a Technology, Organisation & People (TOP) multi-perspective model to conduct five case studies obtaining various technical, organisational and personal issues associated with the adoption of mobile information systems. These findings will help other large organisations to better manage their geographically distributed assets and workforce.