Ethnography is now one of the key approaches used within the CSCW community to specify the role of computer based systems in work practice. Yet what ethnography involves as a program of inquiries is only discussed in a piecemeal way in the literature. This paper attempts to make up for that absence by describing one fieldwork program (or programme) developed over a number of projects in which ethnography has been allied with computer systems and work practice design. The discussions will be of interest to both expert practitioners of ethnography and novices.