The original characteristics of an office information system, when compared to a conventional information system, imply the need for developing new design methodologies and models, or for substantially changing existing design approaches. In this paper the relevant features of office information systems are outlined and some existing office methodologies and models are classfied and evaluated. Particular emphasis is given to the early phases of the design process, commonly called "conceptual" or "logical" design phases. The basic requirements for conceptual design methodologies in the office environment are derived from the analysis and evaluation of existing design approaches.