Video conference software has been used not only for virtual teams in large companies, but also for classrooms and casual conversations. Software or Video Conferencing Systems (VCS) such as Skype and Google Hangouts allow for more visual cues than just audio conversations. Research suggests that VCS is somewhere between the telephone and face-to-face meetings in terms of media richness. Even though video conferencing does not have the same richness as face-to-face conversations, a study regarding video conferencing has said that richer content-presentation types were positively correlated with higher concentration levels but showed mixed results when correlated with perceived usefulness.