The emergence of CSCW (Computer Supported Cooperative Work) as a distinctive research field opens up a fresh perspective on the design of office information systems. A CSCW technology, called IPSE 2.5, is described in this paper (IPSE-Integrated Process Support Environment). ISPE 2.5 provides a powerful generic platform for building office information systems to support routine work. An approach to modelling office work based on language-action principles, argued to provide a richer and deeper understanding than conventional information mo(telling techniques, is presented. A case study of medical office work is used to demonstrate language-action modelling and to give a flavor of the experience of working in a process-support environment. Several lines of current research are described, including some preliminary field studies.