The document proposes a model-driven engineering method to systematically derive user interfaces for a workflow information system from a series of models. The method decomposes a workflow according to the Cameleon Reference Framework and UsiXML task model. It presents a conceptual model for a workflow information system and describes how the interfaces are designed from task and domain models through to concrete, final user interfaces. The method has been validated through several case studies and partially supported by a software tool.