Community of practice - EduTech Wiki

John Tropea - Delicious Community

They share a certain amount of practices, common goals and common language. They have a social organization that includes formal or informal hierarchies, some idea of social service (members helping each other), and a willingness learn from each other and to share that knowledge. Communities of practice are "groups of people who share a concern, a set of problems, or a passion about a topic, and who deepen their knowledge and expertise by interacting on an ongoing basis."