ECSCW 2013 received 82 competitive paper and note submissions. After extensive review, 15 were selected to form the core of the traditional single-track technical programme for the conference. These are supplemented by exciting workshops and masterclasses that cover a broad range of topics and allow for wider and more active participation. These additional contributions will be published in the Volume 2 Proceedings, together with the expanded selection of demonstrations, videos, and work in progress.Work in progress has been introduced as a new peer reviewed category for ECSCW 2013, and those papers will be included in the Volume 2 Proceedings that will be available online.The technical program this year focuses on work and the enterprise as well as on the challenges of involving citizens, patients, and others into collaborative settings. The papers embrace new theories, and discuss known ones. They challenge the ways we think about and study work and contribute to the discussions of the blurring boundaries between home and work life. They introduce recent and emergent technologies, and study known social and collaborative technologies. Classical settings in computer supported cooperative work are looked upon anew. With contributions from all over the world, the papers in interesting ways help focus on the European perspective in our community.Many people have worked hard to ensure the success of this conference, and we briefly acknowledge them here: all the authors who submitted high quality papers; all those who contributed through taking part in workshops, masterclasses, demonstrations, and the new category of work in progress; the 64 members of a global programme committee, who dedicated time and energy to reviewing and discussing individual contributions and shaping the programme; the people who helped organise the programme: the workshop and masterclass chairs, the chairs of demos and videos, work in progress, student volunteers, and various other practical arrangements. Finally, we acknowledge the student volunteers who provided support throughout the event; and we thank the sponsors and those who offered their support to the conference. Abstract. The title of this paper comes from comments made by an 'angry' ethnographer during a debriefing session. It reflects his frustration with a certain analytic mentality that would have him justify his observations in terms of the number of times he had witnessed certain occurrences in the field. Concomitant to this was a concern with the amount of time he had spent in the field and the implication that the duration of fieldwork somehow justified the things that he had seen; the implication being that the more time he spent immersed in the study setting the more valid his findings and, conversely, the less time, the less valid they were. For his interlocutors, these issues speak to the grounds upon which we might draw general insights and lessons from ethnographic research regarding the social or collaborative organisation of human activities. However, the strong i...