CSCW stands for Computer-Supported Cooperative Work. It is about "groups of users" - how the designing of systems should be done to support their work as a group and how to understand the effect of technology on their work patterns. CSCW comes inside the general sphere of Human-Computer Interfaces (HCI); however, it is now an individual field itself. It has provided us with systems that support group work. These systems or products are called groupware. site 
Time/Space Groupware Matrix.
