Synchronous systems focus the energy of the group. It provides motivation to distance learners to keep up with their peers and continue with their studies. Second, it encourages cooperation and group cognition. Real time interaction helps to develop group cohesion and the sense of being part of a learning community. Third, it offers good feedback.
Synchronous system provides quick feedback on ideas.
It supports consensus and decision making in group activities. And forth, it has the pressure of pacing. It provides a discipline to learning which helps people to prioritize their studies. There are many distance teaching programs that are entirely asynchronous. For example, some programs use print plus computer conferencing, and others may use the Web for both course delivery and interaction.