The aim of this research is to develop an in-depth understanding of the dynamics of online group interaction and the relationship between the participation in an online community and an individual's off-line life. The 2½-year study of a thriving online health support community (Bob's ACL WWWBoard) used a broad fieldwork approach, guided by the ethnographic research techniques of observation, interviewing, and archival research in combination with analysis of the group's dynamics during a one-week period. Research tools from the social sciences were used to develop a thick, rich description of the group. The significant findings of this study include: dependable and reliable technology is more important than state-of-the-art technology in this community; strong community development exists despite little differentiation of the community space provided by the software; members reported that participation in the community positively influenced their offline lives; strong group norms of support and reciprocity made externally-driven governance unnecessary; tools used to assess group dynamics in face-to-face groups provide meaningful information about online group dynamics; and, membership patterns in the community and strong subgroups actively contributed to the community's stability and vitality.

This special thematic section of the Journal of Computer‐Mediated Communication brings together nine articles that provide a rich composite of the current research in online communities. The articles cover a range of topics, methodologies, theories and practices. Indirectly they all speak to design since they aim to extend our understanding of the field. The variety shown in these articles illustrates how broad the definition is of this rapidly growing field known as ‘online communities.’

Abstract:What makes online communities successful? There are many indicators of success. Some are easily observed and measured, such as the number of people registered in the community, or the number who participate, or the number of messages posted, replied to or read over a certain period. How community members judge their community is also important. What do they like or dislike and how committed are they to the community? In this paper, we describe participatory community-centred development -an approach that relies heavily on iterative evaluation. We then point out that standard evaluation techniques are inadequate for evaluating online communities because they do not address sociability. Finally, we propose two approaches from research that can be tailed for evaluating online communities. Both attempt to draw directly on what community users want. The first is rooted in ethnography and the second is a form of heuristic evaluation. The paper ends with an agenda for developing these approaches to make them practical yet robust.

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