The human factors requirements are discussed in terms of support for individuals in a distributed C2 network and interactions to do collaborative work. PRESTO provides access to an orbiting Global Infosphere, a multi-source, multi-media data base on operational conditions and events. The system should facilitate development of shared situation awareness and coordinated actions. The approach to user interface is a concept of “Active View.” The content of each active view is defined by operational tasks and area of responsibility. The diversity of users requires a diversity of active views, each constructed to fit the characteristics of each application. The challenge to human factors is to develop an architecture of collaborative activities which can be mapped into PRESTO's software architecture and modules. These activities can be divided into single multi-media workstation, individual's active views in integrated multi-media format, collaborative transactions between workstations, and data integration into a shared situational representation. Taxonomies for collaborative behaviors and use of multi-media will have to be developed. An application to Joint Task Force is a probable implementation. The JTF is a distributed command group for rapid deployment and control of interservice forces in crisis management.