Abstract
The software for a military command and control (C2) system presents an information space in which the C2 operator must manipulate a complex set of information in order to maintain the common tactical picture. A usability test of C2PC, a C2 system currently used by the U.S. Marine Corps, was performed with 13 Marines as participants. They were given problems designed to require actions similar to what they would encounter during real-world Combat Operations Center (COC) operation. The observations revealed an interesting disconnect between the underlying design assumptions and how beginner C2 operators interacted with the system. They were able to perform simple tasks, but could not combine those simple tasks into realistic tasks. These differences highlight the need for using complex scenarios when testing complex systems.