Most information systems rely on networks in sharing data and information. Here we focus on networks and discuss skills and knowledge that are needed in the network development process. In general, information systems development is based on existing systems. Especially networks follow this rule, because all earlier development work and decisions impact the reliability and flexibility of the network. This makes management of network development and in a wider perspective information systems development an important challenge. Today computers and applications need more bandwidth than ever. Existing networks need to be rebuilt so that there would be more capacity available. One possible solution is network traffic management; the other alternative is changing to faster network technology. However, it is likely that in the future the demand for bandwidth will increase further. Therefore we argue that the skills and knowledge of the persons in the development process is a critical resource.